Email to Aunt Saunny French Onion Soup Source of Recipe Aunt Saunny Prep: 10 min, Cook: 30 min. 1/4 cup vegetable oil 1-1/2 lbs. onions, peeled and thinly sliced 4 cups water 3 vegetable bouillon cubes Heat oil in a skillet. Add onions and cook on medium heat until golden brown. Transfer to a pot. Add water and bouillon and simmer for 30 minutes.