Black Bean & Brown Rice Burgers

I have been trying out different combinations of grains and legumes to make complete protein vegan burgers. I think I prefer these to these, but both were delicious and nutritious. I served them alongside crispy kale chips, and topped them with vegan pesto and pickled red onions. The onions were so tasty and simple to make. The pickling liquid is just equal parts water, rice wine vinegar and sugar.