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Place baguette slices on baking sheet. Place on oven rack 4 inches below broiler. Broil slices until just golden (about 1 minute). Turn; broil just until golden.
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Spread each baguette slice with 1 teaspoon pesto. Slice prosciutto crosswise into ½-inch strips; arrange over pesto on each baguette slice. Evenly divide tomatoes over prosciutto; sprinkle with cheese.
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Broil until cheese is melted (1-2 minutes).
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To Serve: Remove pan from freezer. Using a large spoon, scrape across frozen surface to create ice particles. Serve immediately in frozen stemmed glasses.