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Preheat the oven to 275°. Line a baking sheet with foil and calmly oil the foil. In a tiny saucepan, combine the orange zest with the water and sugar and lift to a boil. Simmer over moderate warmth till syrupy, about 10 minutes. Drain the zest. Spread the strips out on the baking sheet and bake for about forty five minutes, or till dry but no longer browned. Let chilly entirely, then grind to a powder in a spice grinder.
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In a medium saucepan, soften the butter. Add the shallots and cook dinner over rather low warmth till softened, about 4 minutes. Add the diced tomatoes and season with salt and pepper. Duvet and cook dinner over rather low warmth till the the tomato mixture is thick, 10 minutes.
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Preheat the broiler. Spread the tomato mixture in a tiny, shallow baking dish. Layer the tomato slices on high, overlapping them a small. Season with salt and pepper.
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Toss the Parmesan with 1/2 teaspoon of the orange-zest powder and sprinkle over the tomatoes. Broil for 2 minutes, or till golden and bubbling. Reduction sizzling.
Originate Ahead
The orange-zest powder will likely be kept in an airtight container for as much as 2 months.