spinach lasagna recipe

#### Ingredients: ##### For the Sauce: - **2 tablespoons olive oil** - **1 medium onion** (finely chopped) - **3 cloves garlic** (minced) - **1 can (28 oz) crushed tomatoes** - **1 can (15 oz) tomato sauce** - **1 tablespoon tomato paste** - **1 teaspoon dried oregano** - **1 teaspoon dried basil** - **Salt and black pepper** (to taste