1 cup plain Greek yogurt
2 tsp fresh lemon juice
3 egg yolks
1/2 tsp sea salt
1/2 tsp Dijon mustard
1 pinch ground pepper
1 Tbsp fresh dill, chopped (optional)
Hot sauce, to taste (optional)
Use a double boiler or place a strainer/sieve (fine mesh strainer) over a sauce pan filled with water. Place a bowl in the sieve.
Whisk yogurt, lemon juice and egg yolks well.
Heat over simmering water, whisking frequently, until sauce has thickened, approximately 15 minutes. Sauce will become thinner after about 10 minutes and then will thicken again.
Remove from heat. Stir in salt, mustard, pepper and optional dill/hot sauce.