This classic San Francisco-style dressing adds a savory, zesty flavor to cold seafood salads. It is a rich, creamy condiment that balances tangy citrus with a hint of horseradish heat.

List of ingredients

1 cup Mayonnaise – provides the rich, creamy base.
1/4 cup Ketchup – adds a subtle sweetness and reddish hue.
1 TBS Horseradish – gives the dressing its signature spicy kick.
1 tsp Dijon Mustard – adds a sharp, tangy depth of flavor.
Juice of one Lemon – provides acidity to balance the fats.
1 Green Onion, Sliced – adds a fresh, mild onion flavor.
1 tsp Worcestershire Sauce – contributes a savory, umami quality.
1/2 tsp Kosher Salt – enhances all the other seasoning notes.
1/4 tsp Black Pepper – provides a light, earthy spice.

step-by-step instructions

Combine Ingredients: In a large mixing bowl, combine the mayonnaise, ketchup, horseradish, Dijon mustard, lemon juice, sliced green onions, Worcestershire sauce, salt, and black pepper.
Whisk: Stir or whisk the mixture thoroughly until all ingredients are fully integrated and the texture is smooth.
Rest: Allow the dressing to sit for 15 to 20 minutes before serving. This resting period allows the flavors to meld and the horseradish to develop.

Dressing Customization and Variations

Adjusting the Heat Level with Horseradish

The potency of horseradish can vary significantly between brands. If you prefer a milder dressing, start with a teaspoon and gradually increase to the full tablespoon. Because horseradish heat intensifies as it sits, add it last if you are preparing the dressing several hours in advance.

Using Cocktail Sauce Instead of Ketchup

For a more complex flavor profile, substitute the ketchup with a high-quality cocktail sauce or chili sauce. Cocktail sauce often contains added horseradish and lemon, which can deepen the savory notes of the dressing. Ensure you taste the dressing before adding extra salt, as cocktail sauces are often pre-seasoned.

Thinning the Consistency with Olive Oil

If the mayonnaise makes the dressing too thick for your preference, stir in one to two tablespoons of extra virgin olive oil. This will create a smoother, more pourable consistency without compromising the flavor. Add the oil one tablespoon at a time until you reach your desired viscosity.

Integrating Seafood-Specific Seasonings

Adding a pinch of Old Bay or a similar seafood seasoning can enhance the oceanic flavors of the shrimp. This addition works best when the dressing is used on a platter of chilled shellfish. Use a small amount, as these seasonings typically contain a high concentration of salt.

Adding a Spicy Kick with Hot Sauce

To increase the heat beyond the horseradish, add a few dashes of a vinegar-based hot sauce. This provides a different type of heat that hits the tongue immediately, unlike the slow burn of horseradish. Balance this with an extra squeeze of lemon juice to keep the flavors bright.

Building the Perfect Shrimp Louie Salad

Selecting the Best Lettuce Base

Romaine lettuce is the ideal choice for a Louie salad due to its sturdy ribs and crunch. Iceberg lettuce offers a more traditional, watery crispness, while butter lettuce provides a softer, creamier texture. For the best presentation, tear the leaves into bite-sized pieces and chill them before assembly.

Preparing Traditionally Poached Shrimp

Poach raw shrimp in simmering water seasoned with salt and lemon slices until they turn opaque and curl into a ‘C’ shape. Immediately plunge the shrimp into a bowl of ice water to stop the cooking process. This shock prevents the shrimp from becoming rubbery and maintains a snap in the texture.

Incorporating Hard-Boiled Eggs

Boil eggs for 9 to 12 minutes depending on your preference for the yolk’s firmness. Once cooled and peeled, slice them into quarters or thick rounds. Place them around the perimeter of the salad to provide a rich contrast to the tangy dressing.

Selecting and Prepping Fresh Vegetables

Use cherry tomatoes halved lengthwise or diced Roma tomatoes for a burst of acidity. Slice English cucumbers into thin rounds or half-moons to add a refreshing crunch. Ensure all vegetables are patted dry after washing to prevent excess water from thinning the dressing on the plate.

Adding Ripe Avocado for Texture

Select an avocado that gives slightly when pressed but is not mushy. Dice the avocado into one-inch cubes and toss them gently with a small amount of lemon juice to prevent oxidation. Add these to the salad just before serving to keep them fresh and green.

Arranging the Salad in Nicoise Style

Instead of tossing the ingredients, arrange the lettuce on a large platter and place the shrimp, eggs, tomatoes, and cucumbers in distinct sections. This presentation allows guests to see the freshness of each component. Pour the Louie dressing in the center of the platter or serve it in a separate bowl for dipping.

Storage and Preservation

Refrigeration Guidelines

Store the completed dressing in an airtight glass container in the refrigerator. It will remain fresh and safe to consume for three to five days. Using glass prevents the dressing from absorbing odors from other foods in the fridge.

Preventing Ingredient Separation

Over time, the lemon juice and oil-based mayonnaise may separate slightly. This is a natural process and does not affect the quality of the dressing. Simply stir the mixture vigorously with a spoon or whisk it for a few seconds before serving to restore the emulsion.

Handling Sliced Green Onions

If you plan to store the dressing for more than two days, consider adding the sliced green onions immediately before serving. This keeps the onions crisp and prevents them from releasing too much moisture into the dressing, which can alter the flavor over time.

Serving and Pairing Suggestions

Pairing with Alternative Proteins

While designed for shrimp, this dressing is excellent with lump crab meat or chilled lobster tail. These proteins share the same flavor profile as shrimp and complement the horseradish and lemon. For a plant-based version, try using chilled hearts of palm or roasted chickpeas.

Serving as a Dip for Shrimp Cocktail

This dressing can double as a sophisticated dip for a shrimp cocktail appetizer. Serve it in a small ramekin alongside chilled shrimp and lemon wedges. The creamy texture makes it a richer alternative to traditional cocktail sauce.

Complementary Side Dishes

Pair the Shrimp Louie salad with a side of crusty sourdough bread or a light quinoa salad. The acidity of the dressing cuts through the richness of toasted bread. Avoid heavy side dishes that might compete with the bold flavors of the horseradish and mustard.

Troubleshooting Common Issues

Managing Excessive Horseradish Heat

If the dressing tastes too spicy, you can neutralize the heat by adding more mayonnaise or a small amount of honey. The fats in the mayonnaise coat the tongue, reducing the impact of the horseradish. Honey adds a sweetness that balances the pungency without making the dressing taste like a dessert.

Correcting Overly Sweet Flavors

If the ketchup makes the dressing taste too sweet, increase the amount of lemon juice or add a pinch more salt. Acid and salt work together to counteract sweetness. Add these in small increments and taste after each addition to avoid over-seasoning.

Fixing a Dressing That is Too Thick

If the dressing is too thick to spread or pour, whisk in a teaspoon of water or milk at a time. This will loosen the structure of the mayonnaise without drastically changing the flavor. Stir slowly to ensure the dressing remains an emulsion and does not break.

Frequently Asked Questions

Can I use Greek yogurt instead of mayonnaise?

Yes, you can substitute Greek yogurt for a tangier, lower-calorie option. However, the texture will be less rich, and you may need to add a small amount of olive oil to mimic the creaminess of mayonnaise.

How do I keep the avocado from browning on the platter?

Toss the diced avocado in lemon juice or lime juice before placing it on the salad. The citric acid inhibits the enzyme that causes oxidation, keeping the avocado bright green for several hours.

Is there a substitute for Worcestershire sauce?

You can use a combination of soy sauce and a drop of lemon juice if Worcestershire sauce is unavailable. Soy sauce provides the necessary salty, umami depth that the dressing requires.

Can I make this dressing in a blender or food processor?

You can use a blender for a perfectly smooth texture, but be careful not to over-process. Over-mixing the mayonnaise can cause the emulsion to break, resulting in a greasy consistency. Pulse the ingredients instead of running the blender continuously.

What is the best way to poach shrimp for this salad?

Simmer water with salt, a lemon slice, and a few peppercorns. Add the shrimp and cook for 2 to 3 minutes until pink, then immediately move them to an ice bath. This ensures the shrimp remain tender and juicy.