In a large skillet over medium heat, melt 2 tablespoon butter. Add shrimp, red onions, tomatoes, Italian parsley, crushed red pepper flakes, and season with salt and pepper to taste. Cook, stirring occasionally, until shrimp is pink and opaque, about 3 minutes per side. Remove from heat and stir in remaining butter, lemon juice, and white wine. Season with salt and garnish with parsley before serving. Serve over Jasmine or Forbidden black rice.