Boy, Oh Boy, Black Bean Salad
Ingredients:
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2 tablespoons extra-virgin olive oil
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1 onion, thinly sliced
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1 teaspoon kosher salt
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½ teaspoon red pepper flakes
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½ teaspoon ground black pepper
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2 cloves garlic, chopped
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1 (15 ounce) can black beans, drained
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1 (10 ounce) can diced tomatoes with green chile peppers
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1 (10 ounce) bag fresh baby spinach