French Onion-Mushroom Soup
| Yield: | 4 Servings |
| Categories: | Soups, Vegetables |
| 3 | tb | Margarine |
| 2 1/2 | c | Onions; sliced |
| 1 | lb | Mushrooms; sliced |
| 2 | tb | White wine vinegar |
| 4 | Vegetable bouillon cubes | |
| French bread; (4 slices) | ||
| 1 | c | Swiss cheese; shredded |
| 1/4 | c | Parmesan cheese |
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