Tournedos Rossini is a classic French dish combining beef tenderloin, foie gras, and truffles.

### Ingredients (serves 4):
- 4 beef tournedos (about 150-200 g each)
- 4 slices of foie gras (about 50 g each)
- 4 slices of white bread, lightly toasted
- 100 g black truffles (or truffle paste if unavailable)
- 50 ml Madeira or Port wine
- 50 ml veal stock
- 50 g butter
- Salt and pepper
### Instructions:
1. **Prepare the ingredients:**
- Take the tournedos out of the refrigerator to bring them to room temperature before cooking.
- Wash and dry the truffles if using fresh truffles, then slice them thinly.
- Lightly toast the slices of bread and set them aside.
2. **Cook the tournedos:**