Adjust rack to middle position (middle and top positions for 4 servings) and preheat oven to 450 degrees. Wash and dry produce.

Trim and thinly slice scallions, separating whites from greens. Trim green beans if necessary.

In a small microwave-safe bowl, combine hoisin, ¼ tsp garlic powder (½ tsp for 4), and 1 TBSP water (2 TBSP for 4). (You’ll use more garlic powder later.) Microwave until warmed through, 30 seconds.

Heat a drizzle of oil in a small pot over medium-high heat. Add scallion whites; cook until softened, 1 minute.

Stir in rice, 1¼ cups water (2¼ cups for 4 servings), and a big pinch of salt. Bring to a boil, then cover and reduce heat to low. Cook until rice is tender, 15-20 minutes.

Keep covered off heat until ready to serve.

While rice cooks, pat pork* dry with paper towels; season all over with salt and pepper.

Heat a drizzle of oil in a large pan over medium-high heat. Add pork and sear, turning occasionally, until browned all over, 4-8 minutes.

Transfer pork to one side of a baking sheet. (For 4 servings, spread pork out across entire sheet.)

On opposite side of sheet from pork, toss green beans with a drizzle of oil, salt, and pepper. (For 4 servings, add green beans to a second baking sheet; roast pork on middle rack and green beans on top rack.)

Roast on middle rack until pork is cooked through and green beans are tender, 10-12 minutes.

In the last 3-5 minutes, remove sheet from oven; carefully pour half the hoisin glaze over pork, turning to coat. Return to oven until glaze is tacky.

Transfer pork to a cutting board. Let rest at least 5 minutes.

Meanwhile, in a second small bowl, combine mayonnaise, remaining garlic powder to taste, and as much Sriracha as you like. Stir in water 1 tsp at a time until mixture reaches a drizzling consistency.

Fluff rice with a fork; stir in 1 TBSP butter (2 TBSP for 4 servings) and season with salt and pepper. Toss green beans with ponzu and half the sesame seeds.

Thinly slice pork crosswise. Divide rice, green beans, and pork between plates. Drizzle pork with remaining hoisin glaze; drizzle everything with as much Sriracha mayo as you like. Top with scallion greens and as many remaining sesame seeds as you like. Serve.