Melt the butter slowly in a medium saucepan over low heat.
Stir often to prevent burning.
Add minced garlic to the melted butter.
Cook for about a minute until you smell the fragrant garlic.
Mix in the lemon juice, salt, and black pepper.
Stir well to combine all the flavors.
Add the chopped parsley, cilantro, and a pinch of red pepper flakes.
Let the mixture simmer on low heat for about 10 minutes.
Either strain the sauce to remove herbs or leave them in for a more rustic texture.
When ready, serve the sauce warm.