This easy riff on a Thai staple gets big flavor from four basic ingredients: curry paste, coconut milk, yellow bell pepper, and bok choy. It's even heartier ladled over short-grain brown rice or Asian noodles.
Heat oil in a medium saucepan over medium. Add onion, garlic, ginger, and a pinch of salt; cook, stirring, until softened, about 6 minutes. Add curry paste; cook 1 minute. Add coconut milk and 1 1/2 cups water; bring to a simmer. Add bell pepper and cover; cook 10 minutes. Add bok choy, cover, and simmer until vegetables are crisp-tender, 2 minutes more.
Season salmon with salt; add to curry. Remove pan from heat and cover. Let stand until salmon is just cooked through, about 3 minutes. Gently break up salmon into large pieces. Serve, with lime wedges.