Prepare the rice according to package instructions and set aside.
In a large skillet, melt the butter over medium heat.
Add the minced garlic to the skillet and sauté until fragrant, about 1-2 minutes.
Stir in the red pepper flakes and cook for another 30 seconds.
Add the shrimp to the skillet and cook until they turn pink and opaque, about 3-4 minutes.
Season the shrimp mixture with salt, pepper, and lemon juice, then remove from heat.
To assemble the stacks, use a ring mold if desired: layer rice first, followed by the shrimp mixture, and repeat if needed.
Garnish the stacks with chopped parsley before serving.