Whisk the ground flax in the warm water and let it sit to thicken up.
Place the sunflower seeds in a pan (no oil!) and toast until lightly browned.
Grate the beetroot and chop the parsley.
Place the beans in a large bowl and mash with a potato masher, about half-mashed.
In a pan, add the oil and saute the onion until soft. Add them to the beans.
Add the flax, grated beetroot, parsley, toasted sunflower seeds, soy sauce, cumin, oregano and paprika, and mix well.
Pulse the oats in a blender or food processor until coarsely chopped. Add to the bowl along with the almond flour, salt and pepper.
Mix well, and shape the dough into patties (if they’re too wet, add a little extra oats until they hold nicely).
To freeze: place the patties between sheets of wax paper (or baking paper) and then inside ziplock freezer bags. Remove excess air and make sure they’re properly zipped shut, then freeze for up to 2 months.
To cook: first defrost the patties (or use freshly-made), and fry in a little bit of oil over medium-high heat, for 3-4 minutes each side. Serve immediately, with burger buns and nice toppings (e.g. baby spinach, tomato and cucumber slices, mustard, caramelised onions, avocado).