Preheat oven to 400 degrees F. Line a baking sheet with parchment paper or foil.
Place grapes and rosemary on baking sheet. Add oil, salt, and pepper and mix. Arrange grapes in a single layer and bake until sizzling and some have burst, approximately 20 minutes.
Once roasted, break rosemary off its stem and remove stems but keep rosemary with grapes.
Spread 1 to 2 tablespoons of ricotta on each slice of bread and top with grapes and rosemary.
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Notes
Notes: moon drop grapes are long and have dark sapphire skin – almost black. Seedless. Juicy sweet flavor. Shape allows for interesting culinary applications.