Preheat your oven to 400°F/200°C. Place a piece of parchment paper on a baking sheet (use two if your baking sheets are smaller).
Remove the tofu from its package and press lightly either using a tofu press or by wrapping tofu in a dish towel, and press to remove excess fluid.
Drain the liquid from the can of chickpeas into a measuring cup. Measure out 3/4 cup of liquid. Discard the rest. Add the ground flaxseed to the chickpea liquid.
Chop the gently pressed tofu into large cubes. Place it in a food processor. Add the chickpeas and the ground flaxseed liquid. Pulse until mostly combined.
Add the pepperoni spices and pulse to combine.
Add the vegetable oil, maple syrup, and beets. Pulse again until mostly combined.
Add the sun-dried tomatoes and then pulse again, leaving bits of the sun-dried tomatoes throughout the dough for a textured pepperoni look.
Take a taste test: Add more liquid smoke, maple syrup, or crushed pepper, depending on your preference for smoky, sweet, and spicy.
Turn the dough out onto your prepared baking sheet and use a spatula to press it out to about ⅛ to ¼-inch thickness.
Place in the heated oven and bake for 25 to 30 minutes, until it starts to look a little crispy on the edges. Remove from oven and cool. Then use a small round cookie cutter to cut out pepperoni rounds. Save the uncut edges to use in things like pasta, where you'd like some pepperoni flavor.
This pepperoni will last up to 5 days in the fridge or can be frozen for up to 2 to 3 months.