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Soak shiitakes in boiling water for at least 30 minutes, then drain and roughly chop in a food processor. Cook lentils for 13 minutes, drain and reserve. Roast walnuts and sunflower seeds in a 200 degree oven. Mix the quinoa egg and let rest.
Sautee the shiitakes, then add onions and fry on medium flame until they start to brown. Add garlic, fry until soft and aromatic. Add tomato paste and mix well. Deglaze with soy sauce and worcester sauce, transfer to a mixing bowl and season with salt.
In a covered pan, gently fry the sweet potato until soft. Mash roughly using a wooden spoon and add to the mixing bowl. In a food processor, pulse half the lentils and add them to the mixture along with the other half. Add quinoa egg and mix well. Adjust seasoning with salt and sauces.
Mix tomato paste, balsamic vinegar and maple syrup.