Preheat the broiler on high. Line a baking sheet with parchment paper.
Combine tomatoes, cilantro, juice, jalapeno, onion, garlic, sugar, salt & pepper in a medium bowl. Cover & let stand.
Arrange the bread slices in a single layer on the baking sheet. Spread each slice with warmed beans. Sprinkle each slice with cheese. Broil, 6 inches from the heat, for 2 to 3 minutes or until the cheese is melted & bubbling.
Top with tomato mixture. Serve immediately. Serves 6 as an appetizer or 3 to 4 as a main.