2 tbsp chopped fresh dill, plus sprigs to garnish (optional)
1 tbsp freshly squeezed lemon juice
2 tbsp finely chopped red onion
115g/4oz mayonnaise
salt and freshly ground black pepper
1 tbsp unsalted butter
125驳/4陆辞锄 soured cream
225g/8oz shrimp, peeled, cooked and chopped