Preheat the oven to 350 F.
In a high-speed blender, combine the roasted red peppers, harissa, cumin, garlic powder, onion powder, salt, and pepper.
In an 8 x 8-inch baking dish, place the tofu and pour the mixture on top. Bake for 30 minutes.
Meanwhile, rinse the leeks, halve them lengthwise, and slice into half moons.
Remove the dish from the oven, add the leeks, and bake for another 5 minutes.
Serve over cauliflower rice and vegetables. Top with fresh lemon juice and herbs.