Peel and devein shrimp, reserve shells for stock
Preheat oven to 400°
In an oven safe skillet on medium heat, melt butter and add onion and garlic, saute for 3 to 4 mins
Add orzo and stir to coat with butter.
Add shrimp stock, tomatoes and oregano, cover and bring to a boil to cook the orzo, 12 minutes.
Taste, add salt and pepper as desired
Stir in peas, lemon juice, and pepper flakes, then lay shrimp into the orzo
Place in oven 12 minutes to cook the shrimp
Remove from oven and serve