Smoked Trout Crostini with Grilled Fennel and Red Onions

Name: Smoked Trout Crostini with Grilled Fennel and Red Onions
Yield: 10 Servings
Ingredients: 20 1/2-inch-thick diagonal slices crusty baguette; 20 1/2-inch wedges fresh fennel bulb (from about 2 large bulbs), fronds reserved for garnish; 20 1/2-inch wedges red onion (from 2 large onions); Olive oil; 3 4 1/2-ounce packages skinless smoked trout fillets,* broken into chunks