Add 1/2 teaspoon salt, coconut milk, red chili flakes and 1/2 cup vegetable broth. Bring to a simmer over medium heat; cook 5 minutes.
Nestle salmon fillets in the coconut mixture and cover; simmer gently for 8-10 minutes (do not boil) or until fish is opaque and separates easily.)
In the meantime, bring 3 cups vegetable broth with the other half of yellow onion and 1/4 teaspoon salt to a boil in a medium sauce pan. Add grits, bring to a boil again and simmer for 5-7 minutes, stir until grits come to the desired consistency. Stir in Parmesan cheese.
Divide grits into 4 portions and dish onto 4 serving plates evenly. When salmon is done, remove from the pan and place fish on top of the grits.
Increase heat to medium-high. Add frozen vegetables to the coconut mixture. Cook and stir for 5-7 minutes or until vegetables are tender and sauce has thickened.
Serve the vegetables and sauce over salmon and grits. Enjoy!