In a small saucepan, bring the water and chicken bone broth to a boil over medium-high heat.
Slowly whisk in the stone-ground grits and a pinch of sea salt; reduce the heat to low and cover.
Simmer the grits for 15-20 minutes, whisking occasionally, until they reach a thick and creamy consistency.
While the grits cook, place the raw shrimp in a bowl and toss with the Cajun seasoning, sea salt, and black pepper until evenly coated.
Heat the avocado oil in a large skillet over medium-high heat.
Add the diced red bell pepper, green bell pepper, and yellow onion to the skillet and sauté for 4-5 minutes until softened and slightly charred.
Add the minced garlic to the vegetables and cook for 30 seconds until fragrant.
Add the seasoned shrimp to the skillet and cook for 2-3 minutes per side until pink, opaque, and cooked through.
Stir the grass-fed butter into the finished grits until completely melted and smooth.
Squeeze the fresh lemon juice over the shrimp mixture, garnish with chopped parsley, and serve the shrimp and vegetables over the creamy grits.