12 whole-wheat lasagna noodles (about 3/4 pound)
2 teaspoons olive oil
12 ounces portobello mushrooms, chopped
1/2 teaspoon salt
4 cups Easy Tomato Sauce, recipe follows, or store-bought marinara sauce
One 15-ounce container part-skim ricotta cheese
One 10-ounce package frozen chopped spinach, thawed and drained
1 egg, lightly beaten
Freshly ground black pepper
Pinch ground nutmeg
3 ounces grated part-skim mozzarella cheese (about 2/3 cup)
1/4 cup grated Parmesan
1 tablespoons olive oil
1 medium onion, finely chopped
2 cloves garlic, minced
3 tablespoons tomato paste
1 teaspoon dried oregano
Two 28-ounce cans whole tomatoes, drained, chopped
1 bay leaf
Kosher salt and freshly ground black pepper