"Sumac--available at spice stores--adds a subtle piney, tangy note, but don't worry if you can't find it: The salad will still have loads of flavor complexity without it. You could also sub 1 teaspoon of prepared horseradish for the wasabi powder...."
INGREDIENTS
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1 cup sugar
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1 cup cider vinegar
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1/2 cup water
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1 teaspoon kosher salt
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2 teaspoons mustard seeds
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1 1/2 teaspoons wasabi powder
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3 tarragon sprigs
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1 English cucumber, thinly sliced
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3 tablespoons extra-virgin olive oil
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2 tablespoons sherry or white wine vinegar
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1/2 teaspoon ground sumac (optional)
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8 cups cubed red watermelon
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3 ounces feta cheese, crumbled (about 3/4 cup)
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1/2 cup chopped fresh mint
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1/4 cup sliced pitted kalamata olives
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1/4 cup chopped fresh dill