Preheat your oven to 425°F (220°C). Line a baking sheet with parchment paper.
Slice the cauliflower into 1-inch thick steaks. Set aside both the steaks and any extra florets for another use or lightly roast them with the main steaks.
Press the firm tofu between paper towels to absorb moisture, then cut into ½-inch thick slabs.
In a shallow bowl, whisk the egg. In another plate, spread out the sesame seeds.
Dip each cauliflower steak and tofu slab first into the egg, then coat evenly with sesame seeds on both sides.
Place the coated cauliflower and tofu pieces on the prepared baking sheet and bake for 20-25 minutes, turning halfway through, until they develop a light crispy crust.
Meanwhile, prepare the ginger-scallion sauce by finely grating the fresh ginger and mixing it with the chopped scallions, soy sauce, rice vinegar, sesame oil, and sriracha in a small bowl.
Lightly boil or steam the shelled edamame for 3-4 minutes until tender but still vibrant, then drain.
Plate the crispy sesame-crusted cauliflower steaks and tofu, drizzle generously with the ginger-scallion sauce, and serve with a side of edamame.
Enjoy your balanced, protein-packed meal!