I looked up Cambray onion and the majority of descriptions claim it to be baby pearl onions. A few sources say that spring onion will be a suitable sub.
- Clean the shrimps, put them on the butter with the onion, salt and pepper in a skillet.
- Add the lime slices, fry till the shrimp is barely cooked through and take them off the flame.
- Add the sour cream and serve.