In a pan, melt butter and sauté onions and beef until the onions are golden brown. In a separate pan, sauté sliced mushrooms, seasoned with salt and pepper to taste.

Once the onions, mushrooms and beef are cooked, mix together and dice, either with a knife, in a grinder or pulsed in a food processor.

Set aside and let cool. Makes 1 ¼ cup (300 mL).