Tuna Melt Canapés

Name: Tuna Melt Canapés
Ingredients: 2-3 tbsp. mayonnaise; 1 1⁄2 tbsp. raisins; 1 tbsp. mango chutney, chopped; 1⁄2 tsp. curry powder; 1 (5-oz.) can oil or water-packed tuna, drained; Kosher salt and freshly ground black pepper, to taste; 2 slices white bread, crusts removed; 2 thin, square slices cheddar cheese; 8 (1″) pieces fresh chives, optional