Shrimp Scampi

INGREDIENTS

• 2 pounds shrimp, peeled and deveined - tails left on
• 1/2 cup shrimp stock, recipe follows
• 2 tablespoons cold butter
• Salt and freshly ground black pepper
• 2 tablespoons chopped garlic
• 2 tablespoons chopped parsley leaves
• 1/2 cup white wine
• Rice, as accompaniment
• 1 small onion, sliced thinly
• Lemon slices, for garnish
• 1 lemon, juiced
• Olive oil