Thoroughly wash the dill, removing any tough stems. Finely chop until you have 1/4 cup packed dill. Zest the lemon before juicing to capture the aromatic oils at their peak.
In your non-reactive bowl, combine the Greek yogurt and mayonnaise. Mix thoroughly with a spatula until completely homogeneous with no visible streaks, approximately 30-45 seconds.
Add the microplaned garlic, lemon zest, and Dijon mustard to the base. These ingredients contain volatile compounds that will begin to permeate the fat molecules in the base mixture.
Incorporate the fresh lemon juice gradually while stirring constantly. This prevents potential protein coagulation in the yogurt that could result in a grainy texture.
Fold in the chopped dill, ensuring even distribution throughout the mixture without overmixing, which can bruise the herbs and cause discoloration.
Add salt and pepper, then taste and adjust as needed. If the sauce seems too tangy, incorporate optional honey in 1/4 teaspoon increments until balanced.
For best flavor development, cover and refrigerate the sauce for at least 30 minutes (preferably 2 hours) before serving to allow flavor compounds to fully distribute and hydrate.