1. Bring rice, a pinch of salt, and 2½ cups cold water to a boil in a medium saucepan over medium-high heat. Stir once, cover, and reduce heat to low. Cook until water evaporates and rice is tender, 18–20 minutes. Remove from heat; let sit, still covered, 10 minutes.
2. Whisk sugar, ¼ cup vinegar, and 2 tsp. Diamond Crystal or 1¼ tsp. Morton kosher salt in a small bowl until sugar dissolves. Stir into rice; re-cover. Let sit until ready to use.
3. Whisk maple syrup, miso, tamari, ½ tsp. red pepper flakes, and remaining ¼ cup vinegar in a small bowl. Set glaze aside.
4. Heat oil in a large nonstick skillet over medium. Season salmon with salt; cook, skin side down, shaking pan occasionally, until skin is…
