Bean Salad with Fresh Grilled Tuna
Rinse, trim and blanch green beans in salted boiling water, about 5 minutes. Drain and rinse with cold water. Let drain well. Rinse white beans in a colander and drain well.
Peel onion and cut into thin strips. Rinse and halve tomatoes. Rinse tuna, pat dry, remove any excess skin or tendons and cut into 2 cm (approximately 3/4 inch) cubes.
Heat 2 tablespoons oil in a hot grill pan. Add tuna cubes and sear briefly on all sides. Season with salt and pepper, remove from pan and gently mix with remaining salad ingredients. Mix 3 tablespoons oil with lemon juice and toss with salad. Season with salt and pepper and serve in bowls.