Squeeze the sweet pickle relish in a fine-mesh strainer or cheesecloth to remove excess liquid, preventing a watery dressing that dilutes the mayo base.

Finely chop the parsley and chives just before mixing to maximize their fresh flavor and ensure they're evenly distributed throughout the creamy dressing.

Add lemon juice gradually while whisking, tasting as you go, since the horseradish and Worcestershire already provide tang—this prevents the dressing from becoming too sharp.

Opt for freshly grated horseradish root instead of jarred when possible, as it delivers a more vibrant, pungent kick that defines authentic Louie dressing.

Refrigerate the finished dressing for at least 30 minutes to allow flavors to meld and mellow, creating a more cohesive and sophisticated taste profile.