01 - Bring water or chicken broth to a boil in a medium saucepan. Whisk in the stone-ground grits and reduce heat to low. Cook for 20 to 25 minutes, stirring frequently, until the mixture achieves a thick and creamy consistency.
02 - Stir in the butter, whole milk, salt, black pepper, and shredded sharp cheddar cheese. Continue stirring until the cheese melts completely and the grits become smooth. Cover to maintain warmth.
03 - While the grits cook, toss the peeled and deveined shrimp with Cajun seasoning in a bowl until evenly coated on all sides.
04 - Heat olive oil in a large skillet over medium-high heat. Add the seasoned shrimp and cook for approximately 2 minutes per side, or until the shrimp turn pink and opaque throughout.
05 - Add minced garlic to the skillet and cook for 30 seconds until fragrant. Stir in the butter and fresh lemon juice, allowing the butter to melt. Remove from heat immediately and sprinkle with chopped fresh parsley.
06 - Spoon the prepared cheddar grits into serving bowls. Arrange the Cajun shrimp on top of the grits and drizzle with the remaining pan juices from the skillet. Garnish with sliced green onions and additional shredded cheddar cheese if desired.