In a large saucepan, bring water to boiling. Stir in barley, rice, and lentils. Bring to boiling; reduce heat. Cover; simmer 40 to 45 minutes or until grains are tender (if needed, add water during cooking, 1/4 cup at a time). Drain liquid. Cool; transfer to a bowl. Cover; chill 2 to 24 hours.

Heat the 2 tablespoons olive oil in a large skillet* over medium-high heat. Add the carrots, onion, celery, broccoli, nuts, and garlic. Cook and stir 5 to 6 minutes or until vegetables are tender.

Stir in basil, oregano, salt, and thyme. Transfer to bowl. Cover; chill 2 to 24 hours.

Before serving, mix the grains and vegetable mixtures. Stir in egg whites and flour. Form into twelve 3/4-inch-thick patties (use moistened hands, if needed).

In a very large skillet, heat the 2 tablespoons olive oil over medium heat. Cook patties, 6 at a time for 10 to 12 minutes or until golden brown, turning once. Serve on toasted hamburger buns or Kaiser rolls with lettuce and sliced tomatoes, if you like. Makes 12 burgers.

Instead of frying, bake the uncooked burgers in a 375 degree F oven 15 minutes or until heated. Also, for a make-ahead version, freeze the uncooked burgers and thaw them before cooking.