First, preheat the oven t0 180 degrees C/350 F. Meanwhile, cook the lentils according to packaging instructions until softened, but not mushy - this usually takes around 7-8 minutes. Drain and rinse when done.
Add the walnuts and lentils to a blender or food processor. Pulse until a walnut 'paste' forms.
Transfer the walnut and lentil mixture to a large mixing bowl together with the oat flour, carrot, mustard, paprika, cumin, dried basil and tamari. Stir together really well, using your hands if necessary to form a 'dough'.
Using around ⅓-1/2 cup dough per burger, shape the dough into patties and lay them out on a sheet of baking paper over a baking tray.
Bake for 25-30 minutes, until golden brown and crispy on the outside.
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