Crostini with Smoked Trout and Lemon Zest

Ingredients

• 1/4 cup mayonnaise
• 2 small cloves garlic, minced
• 1 1/2 teaspoons lemon juice
• 1 teaspoon grated lemon zest
• 1/8 teaspoon cayenne
• 1/2 teaspoon sweet paprika
• 2 green onions, white and green, thinly sliced
• Salt and freshly ground black pepper
• 1 1/2 cups smoked trout, (3 oz.) bones removed, flaked
• 18 slices rustic, coarse textured bread, 2 1/2-inch by 2 1/2-inch slices, 1/2-inch thick
• 1 ounce caviar, American sturgeon, salmon, osetra, beluga or sevruga