## Ingredients - 3 egg yolks - 1 Tbsp acid, like lemon juice or vinegar - 1 tsp mustard - 1/4 tsp salt - Pinch of cayenne pepper - 1/2 cup hot melted butter ## Instructions 1. Combine all ingredients except for butter 2. While mixing the above with an immersion blender, stream in hot butter until combined 3. Serve! Immediately!