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Balsamic Dressing: Whisk together the vinegar, sugar, mustard, salt and pepper.
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Whisk in olive oil in a thin, steady stream until dressing is emulsified.
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Salad:Preheat oven to 350 degrees and line a sheet pan with parchment paper.
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Lay the prosciutto slices in a single layer on the prepared sheet pan and bake for about 15 mins or until crispy, but not burned. Cool and crumble.
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Turn your grill onto high heat.
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Cut the watermelon into 1 inch slices and remove rinds. Brush the watermelon with the olive oil and season with salt and pepper.
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Grill until charred grill marks show on one side, about 3 mins. Flip over and grill an additional 3 mins or until charred marks show.
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Cut watermelon into chunks.
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Toss arugula, basil and scallions with a small amount of dressing and spread onto a large platter. Scatter watermelon over the greens and sprinkle with shaved parmesan and crispy prosciutto crumbles.
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Drizzle with dressing to taste.