Add the cauliflower florets to a food processor and pulse until the pieces are as small as traditional grits. Work in two batches if needed.
Heat 1 tablespoon of butter in a medium saucepan over medium heat.
Transfer all of the cauliflower to the saucepan, add almond milk, remaining butter, 1/2 teaspoon sea salt, and a few grinds of black pepper.
Simmer over medium-high heat, stirring frequently, until the mixture thickens and resembles creamy grits (about 10 minutes).
Remove from heat and stir in the Parmesan cheese. Taste and adjust seasoning with more salt and pepper if needed. Cover to keep warm.
In a large skillet, melt the remaining butter over medium-high heat. Add the shrimp and sprinkle with blackened seasoning, tossing to coat.
Cook the shrimp until they're pink and cooked through, about 4-5 minutes. Add parsley, a squeeze of fresh lemon juice, and 1 tablespoon of water to deglaze the pan.
Divide the cauliflower grits into shallow bowls. Top with blackened shrimp and garnish with fresh parsley.
Serve immediately and enjoy!