Oven: Preheat the oven to 350°F (180°C).
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Chop: Core the red pepper, cut it into strips, and in small dice. Chop the sun-dried tomatoes.
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Walnuts: Add the walnuts to a food processor fitted with an S-blade. Blitz until roughly crushed.
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Chorizo mixture: Drain and rinse the lentils. Add them to the food processor with the sun-dried tomatoes, tomato paste, maple syrup, olive oil, smoked paprika, cumin, salt, and a pinch of cayenne pepper. Blend until combined. Scrape down the sides a few times if needed.
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Bake: Transfer the mixture onto a lightly oiled or parchment-lined baking sheet. Press it flat with your fingers. Add the diced red peppers on the side or onto a separate baking sheet. Bake it for 20 minutes.
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Make the avocado crema: Pit the avocado and add the flesh to a blender with the water, cilantro, lime juice, garlic powder, and salt.
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Flip: Run a spatula under the chorizo mixture. Flip it chunk-wise and break them up with the spatula. Bake for another 10 minutes to help them crisp up.
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Serve: Heat your tortillas in the oven. Serve with vegan sour cream, walnut chorizo, roasted red peppers, and top it with avocado crema.