For the salad:
4 tuna steaks, 4 - 6 oz. each
1 lb. small red potatoes, cut in half and boiled till just fork tender, about 15 minutes
1/2 lb. green beans, trimmed and steamed until they are tender-firm, about 6 minutes
1 red bell pepper, seeded and cut into 1/4-in. julienne strips
1 c. cherry or grape tomatoes, cut in half
3/4 c. pitted Nicoise olives
6 c. mixed baby field greens
anchovy fillets (optional)
salt and freshly ground pepper to taste
For the vinaigrette:
1/2 c. extra-virgin olive oil
juice of 1 large lemon
1 Tbsp. Dijon mustard
salt and freshly ground pepper