Lentil and Tuna salad

2 ripe tomatoes, seeded and finely chopped
1 small red onion, finely chopped
14 ounce can lentils, rinsed and drained
6 1/2 ounce can albacore tuna, drained
2 tablespoons chopped fresh cilantro
Dressing: 4 tablespoons olive oil
2 tablespoons lemon juice
1 teaspoon whole-grain mustard
1 garlic clove crushed
1/2 teaspoon cumin ground
1/2 teaspoon coriander ground

Mix together the onion, tomatoes and lentils in a large bowl. Flake the tuna with a fork and stir into the mixture in large bowl. Add chopped cilantro. Whisk together all dressing ingredients and pour over salad. Season with black pepper to taste. serves4