Prepare the Cabbage Wedges: Peel away any damaged or loose outer leaves from the green cabbage. Place the head core-side down on a stable cutting board and cut straight down through the center to create two halves. Slice each half into 3 or 4 uniform wedges, ensures the white core stays attached to each piece to hold the leaves together.
Season Thoroughly: In a small bowl, whisk together the 3 tablespoons of extra virgin olive oil, garlic powder, salt, and black pepper. Use a pastry brush to apply the mixture generously over all exposed sides of the cabbage wedges.
Sear the Wedges: Heat a large grill pan or a heavy cast-iron skillet over medium-high heat. Place the seasoned wedges down on a flat, cut side. Sear undisturbed for 4 to 5 minutes until deeply charred, blistered, and caramelized on the edges. Carefully flip to the other cut side and sear for another 4 to 5 minutes.
Steam Until Tender: Turn the heat down to medium-low. Cover the pan securely with a tight lid or a tent of foil to trap the steam. Cook for an additional 10 minutes until the thickest part of the wedge is fork-tender.
Blend the Whipped Feta: While the cabbage cooks, place the crumbled feta cheese, Greek yogurt, olive oil, lemon juice, and minced garlic into a food processor. Blend on high speed for 2 to 3 minutes, scraping down the sides as needed, until the texture is completely smooth, airy, and creamy.
Whisk the Glaze: In a small bowl, combine the raw honey, Sriracha, and rice vinegar. Whisk together until it forms a uniform, glossy, and pourable consistency.
Assemble the Dish: Lay the warm, charred cabbage wedges out on a flat serving platter. Spoon a generous line of the smooth whipped feta cream straight down the center of each wedge. Shower the cream with the chopped scallions, then drizzle the glossy Sriracha honey evenly across the top before serving.