Avocados are buttery and creamy, but "something pickled is always great, whether it be pickles themselves or pickled red onions" to bring a pop of sour crunch to complement the savory and tender bite of black bean burgers.
Caramelized onions, for example, could use a savory pairing like meaty, umami-rich sauteed mushrooms or a spicy, smoky complement like roasted poblano or bell peppers.
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