- In a medium bowl, stir or whisk together the flaxseed meal and 2 tablespoons [¼ cup] warm water. Let stand, undisturbed, while you prepare the remaining burger ingredients.
- Finely chop the mushrooms, apricots, and cashews.
- Rinse the lentils.
To the bowl with the flaxseed mixture, add the mushrooms, apricots, cashews, lentils, and panko and season with salt and pepper. Using a fork, masher, or the bottom of a bowl, mash the mixture until well combined.
Alternatively, in a food processor, add the mushrooms, apricots, cashews, and half the lentils and pulse until finely chopped. Add the flaxseed mixture, panko, and remaining lentils, season with salt and pepper, and pulse until combined but not quite smooth.
If the mixture feels dry, add 1 to 2 tablespoons water. Using wet hands, form the mixture into two [four] 1-inch-thick patties.