This lasagne is easy to make and meat-free, with alternating layers of complementary, contrasting flavours: smashed tomato sauce, lemon and herb scented zucchini, cinnamon roasted sweet potato and creamy ricotta and Parmesan-laced béchamel. Tomatoes are a wonderful source of vitamin B6, C, K, beta-carotene, potassium and manganese, while capsicums are...