Crostini is an Italian appetizer consisting of small slices of toasted bread with a topping. Today's recipe features onion, zucchini, eggplant, bell peppers, and tomatoes as the topping. Let me tell you, this appetizer is so delicious and perfect for your next dinner party or book club! The great thing about vegetables is that eating a lot of them can drastically decrease the chance of chronic diseases. They also promote weight-loss and a number of vegetables are considered a super-food. Tomatoes target the health of the heart and are low in calories as the zucchini is full of potassium and vitamin A.