For grits: In a large saucepan, bring 4 cups water and salt to a boil over medium-high heat. Gradually stir in grits; reduce heat to medium-low, partially cover, and cook, stirring occasionally, until thickened and tender, about 30 minutes. Add cheese, butter, and hot sauce, stirring until cheese is melted.
For fish: In a large cast-iron skillet, melt butter with oil over medium heat.
In a small bowl, combine salt and pepper; sprinkle all over fish. Add fish to skillet, and cook until golden brown and fish flakes easily with a fork, about 4 minutes per side. Remove fish from skillet. Wipe skillet clean.
For tomatoes: In same skillet, add tomatoes cut side down, and cook over medium-high heat until browned and softened, about 4 minutes. Gently fold in capers, salt, and pepper. Remove from heat, and stir in chives. Serve fish and tomatoes over grits. Garnish with chives, if desired.
Recipe by Louisiana Cookin' at https://louisianacookin.com/pan-seared-redfish-with-blistered-tomatoes-and-smoked-gouda-grits/