INGREDIENTS
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1/4 small red onion, thinly sliced
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1/2 teaspoon fresh lemon juice
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1/2 teaspoon capers, coarsely chopped
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1 teaspoon extra-virgin olive oil
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kosher salt and ground black pepper
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1 teaspoon lemon zest
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1/2 avocado, pitted
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2 slices whole-grain bread, toasted
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1 ounce smoked trout or 1/2 soft-cooked egg, for topping (optional)