Home » Recipes » French onion soup. Suggestions? French onion soup. - Recipe Cost Cost information for the following is not included. Normally this is because the quantity or ingredient is unknown white pepper croutons or stale French bread Ingredients Per Serving Qty Common Price Price per Serving 3 T butter or olive oil 3/4 teaspoon $3.99 per 16 ounces $0.03 4 large white onions, thinly-sliced 1 onions $0.79 per pound $0.26 1 t salt 1/4 teaspoon $2.91 per 16 ounces $0.01 ½ t dry mustard 1/8 teaspoon $2.69 per 8 ounces $0.01 dash of thyme 1/4 pinch $1.97 per 2 ounces $0.00 5 cups vegetable stock and/or water 1 1/4 cups $3.69 per 32 ounces $1.19 2 T soy sauce 1/2 teaspoon $2.59 per 10 fluid ounces $0.02 2 T dry white wine (optional) 1/2 teaspoon $0.35 per fluid ounce $0.03 cheese: Gruyère or Swiss, grated or sliced (optional) 1/4 cheese $6.99 per 32 ounces $0.05 Total per Serving $1.61 Total Recipe $6.44 Please Log In or Sign Up to edit Recipe Cost info Email Recipe Cost Send To Message (if any) or Close