01 - Preheat oven to 425°F (220°C). Line a large baking sheet with parchment paper or a silicone mat.
02 - In a large bowl, whisk together flour, cornstarch, garlic powder, salt, and black pepper. Gradually add water, whisking to form a smooth, thick batter.
03 - Dip each cauliflower floret into the batter, allowing excess to drip off. Coat well with panko breadcrumbs and arrange on the prepared baking sheet in a single layer.
04 - Bake for 22–25 minutes, flipping halfway, until golden and crispy.
05 - Meanwhile, in a small saucepan over medium heat, combine honey, Sriracha, soy sauce, rice vinegar, butter, and sesame oil. Bring to a simmer, stirring, until butter is melted and sauce is glossy, about 2–3 minutes. Remove from heat.
06 - When the cauliflower is done, let cool for 2 minutes, then transfer to a large bowl. Pour the sauce over and toss gently to coat.
07 - Serve immediately, garnished with cilantro, sesame seeds, and lime wedges if desired.