Melt the butter in a small saucepan over medium heat. Remove from the stovetop—place in a small mixing bowl.
Zest ½ the lemon, then juice half the lemon as well. Mince the shallots and slice the green onions.
Add the ingredients to the bowl with the butter, lemon juice, zest, minced shallots, dijon mustard, parsley, green onions, paprika, red pepper flakes, chili powder, and Worcestershire sauce. Stir to combine.
Serve in a pretty dish warm as a dipping sauce with steak, pork, or chicken. Enjoy!