Beurre à la Bourguignonne, or garlic butter, is a compound butter flavored primarily with garlic. In this case, it also includes shallots and parsley.
½ cup butter
2 tbsp chopped shallots
1–3 cloves garlic, mashed or grated with a microplane
2 tbsp parsley, chopped
Salt
Pepper
Cream the butter until it is very soft.
Beat the shallots, garlic and parsley into the butter.
Season to taste with salt and pepper.