Whitney'S Favorite Tenderloin - cooking recipe

Ingredients

3 to 4 lb. beef tenderloin
1/2 c. chopped red onion
1 1/2 Tbsp. butter
1 c. red cooking wine
3 Tbsp. soy sauce
2 Tbsp. dry mustard
1/8 tsp. salt and pepper

Preparation

Bake tenderloin at 400\u00b0 for 10 minutes.