STEAM the cauliflower for about 10 minutes, until tender.
TRANSFER to a large bowl and add the lemon juice, lemon zest, and butter.
USE an immersion blender to blend until smooth. Season with salt and pepper to taste.
COOK the bacon in a large pan until crisp. While the bacon cooks, whisk together the mayonnaise, mustard, apple cider vinegar, salt, garlic powder, and paprika until smooth.
DRAIN any excess fat from the pan and reduce heat to medium.
ADD the shrimp to the pan and cook for 3-4 minutes, until the shrimp begin to turn pink.
STIR in the sauce and simmer for another 3-4 minutes, until the shrimp are cooked through.
SERVE the shrimp with a lemon wedge and garnish the mashed cauliflower with fresh parsley.