INGREDIENTS
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1/4 cup finely chopped chives
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1/4 cup mayonnaise
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1/4 cup tarragon
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1/4 cup whole-milk Greek yogurt
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1 lemon, halved
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2 tablespoons extra-virgin olive oil, plus more for drizzling
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Kosher salt, freshly ground pepper
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1/2 head of butter or Bibb lettuce (about 2 ounces), large leaves torn
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1/4 English hothouse cucumber, thinly sliced
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1 avocado, thinly sliced
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4 slices grainy bread
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8 ounces fresh mozzarella, sliced 1/4 inch thick
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2 cups sprouts (such as broccoli sprouts or alfalfa)