Marinated Lentils with Crunchy Vegetables

Name: Marinated Lentils with Crunchy Vegetables
Ingredients: 1 large onion, quartered through root end; 2 bay leaves; 1½ cups black beluga or French green lentils, rinsed, picked through; Kosher salt; ¼ cup olive oil; 1 teaspoon coriander seeds; ½ teaspoon cumin seeds; 3 tablespoons sherry vinegar or red wine vinegar; Freshly ground black pepper; 6 radishes, trimmed, very thinly sliced; 4 scallions, thinly sliced; 1 cup parsley and/or mint leaves; 1 cup thinly sliced celery hearts and leaves