INGREDIENTS
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2 English cucumbers, peeled and chopped
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1 avocado, pitted and peeled
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1/2 cup plain low-fat Greek yogurt
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2 tablespoons fresh tarragon leaves, plus more for serving
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1 teaspoon grated lemon zest, plus 3 tablespoons fresh lemon juice
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kosher salt and black pepper
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4 slices whole-wheat bread, toasted
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2 tablespoonsunsalted butter
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4 ouncesthinly sliced prosciutto