Prep: Preheat the oven to 400 F. Line a large baking sheet with parchment paper or a silicone mat and set aside. Add the sunflower seeds to a large bowl and cover with at least 3 cups of boiling water. Let soak for at least 30 minutes, then drain well and set aside. In a small bowl mix the tomato paste, dark soy sauce, and oil together to form a thick paste; set aside.: When you begin, breathe in the bright tang of the tomato paste and the savory depth of the dark soy sauce as you whisk them with oil, a heady aroma that signals the backbone of the dish. The boiling water soaking the shelled raw sunflower seeds softens them so they break down in the food processor, and the warm steam lifts nutty notes that become more pronounced after roasting. A common mistake is not lining the baking sheet, which can lead to sticking and uneven browning; always use parchment or a silicone mat. The oven temperature of 400 F ensures the crumbles develop crisp edges while staying tender inside, and preheating fully is crucial for consistent results.
Season the Tofu: In the meantime, grate the pressed tofu using a box grater and transfer to a large bowl. Add the chili powder, nutritional yeast, cumin, onion powder, garlic powder, smoked paprika, oregano, cayenne (if using), and salt to the bowl. Use a spatula to mix well, until the tofu is evenly coated in spice. (Note: it’s ok if the mixing breaks the tofu into smaller pieces!) Add the prepared tomato paste and soy sauce mixture to the tofu and mix again, using the spatula to evenly distribute the paste and break the tofu into smaller pieces.: Grating the pressed tofu gives you irregular, meat like strands that hold sauce and spices beautifully, releasing a subtle scent of soy that blends with the spices. As you fold in ancho chili powder , nutritional yeast , cumin , onion powder , garlic powder , smoked paprika , oregano , cayenne , and salt , the mixture becomes aromatic and slightly dusty to the touch, indicating even coating. This step matters because evenly seasoned tofu absorbs the tomato soy paste later, giving consistent flavor in every bite. Avoid overmixing to prevent turning the tofu into mush; gentle folding keeps some texture.
Sunflower Seeds: Add the drained sunflower seeds to a food processor with an S-blade attachment. Process for 15-20 seconds, until the seeds are finely chopped and have a similar texture and size to ground meat. Transfer the sunflower seeds to the tofu mixture and fold into the tofu, until coated in spice and evenly mixed.: Processing the drained, soaked shelled raw sunflower seeds until they resemble ground meat creates a tender graininess that mimics crumbled beef. You'll notice a faintly sweet, nutty aroma as the seeds break down; their oil begins to release, enriching the mix. After pulsing, folding these processed seeds into the tofu adds body and bite, ensuring the final texture is substantial. A frequent error is overprocessing into a paste, which makes the mixture gummy; pulse briefly and check texture often.
Bake: Spread the tofu sunflower mixture evenly across the baking tray. Bake on the top rack of the preheated oven for 15 minutes, then remove from the oven and do your best to flip the crumbles. Return to the oven and bake for an additional 15 minutes.: Spreading the tofu and sunflower mixture evenly across the prepared baking tray allows hot air to crisp the edges and concentrate flavors into caramelized pockets, where sugars in the tomato paste brown and the soy sauce deepens. The sound shifts from quiet to a faint sizzle as the mixture roasts, and visually you’ll see edges darken and small bubbling in places where oil concentrates. Flip the crumbles after the first 15 minutes to expose different surfaces and promote uniform browning; this technique produces a mix of tender interior and crisp exterior, which is key for mouthfeel. One common pitfall is overcrowding the tray, which leads to steaming rather than crisping, so spread the mixture thinly for best results.
Serve & Store: Use immediately in tacos or burritos, or serve as desired. Store any leftovers in an airtight container in the refrigerator for up to 5 days. You can also freeze this taco meat; let cool completely at room temperature, then transfer to a freezer-safe bag or container and store in the freezer for up to 2 months.: When the sheet pan comes out of the oven, the aroma should be rich, smoky, and slightly caramelized, a clear sign of successful roasting. Let the mixture cool briefly so it firms up a bit, making it easier to scoop into tacos or burritos. For leftovers, refrigerate in an airtight container for up to 5 days , or freeze for up to 2 months after cooling completely to room temperature; freezing preserves texture best when the mixture is cooled fully. A typical mistake is sealing warm food which traps steam and makes the filling soggy, so always cool before storing.