| 1 | round | Sourdough bread (or other kind) |
| 1 | tbsp | Red wine vinegar |
| 2 | tsp | Dijon mustard |
| 2 | tsp | Olive oil |
| 1/4 | tsp | Sugar |
| 1/4 | tsp | Salt |
| 1/4 | tsp | Fresh ground pepper |
| 6 | oz | Fresh portabello mushroom caps |
| 1 | C | Torn romaine lettuce leaves |
| 1/4 | C | Chopped sundried tomatoes, in oil |
| 2 | oz | Provolone cheese |
| 1 | med | Tomato, sliced |
| 1 | sm | Onion, sliced |