Add 1 cup of water to the quinoa and simmer in a small pan for 15 minutes, or until soft and no water remains.
Meanwhile, drain, rinse, and dry the black beans. Then transfer to a mixing bowl and mash with a potato masher or fork until most of the beans have broken down, leaving some whole ones.
Add the red onion, cilantro, chilies and salt to the mixing bowl.
Heat a little oil in a frying pan and fry the ginger, garlic, paprika, cumin and curry powder for a couple of minutes. Then transfer to the mixing bowl.
Use your hands to combine everything in the mixing bowl. Take a handful of the mixture and shape it into a burger. Repeat for the remaining 3 burgers.
Chill the burgers in a fridge for 30 minutes.
Heat a little oil in a frying pan and fry the burgers for 6 minutes on each side.
Serve with layers of lettuce, tomato, vegan burger sauce, and slices of gherkin.