Creamy pasta salad with crayfish tails

This is a little bit of a summer dish I think but I thought it sounded really nice so I decided to make it even though it's January. I ended up making a bit of a mistake though so I now have lots of leek in my salad. I do like the taste of onion but it can sometimes be a bit too much.

Ingredients 
Serves 4 people
350 g pasta
1 tbsp butter
2 dl garlic mayonnaise (I just mixed some garlic with regular mayonnaise)
1 dl creme fraiche
salt and black pepper
150 g cooked prawns
150 g cooked crayfish tails
1 box of cherry tomatoes
1 dl cucumber
½ dl leek
½ dl red onion
1 big handful of ruccola

Boil the pasta according to the packet. Drain and mix in the butter. Let it cool.
Mix mayo, creme fraiche, salt and pepper for the dressing.
Mix together the pasta, shellfish, tomatoes, cucumber, ruccola and onions. Pour over the dressing and mix it all together. Serve.

Tip! The original recipe also had ½ dl pesto in the dressing. Since I didn't have any pesto and I'm not a big fan of it I took this out of the recipe. However, if you do like pesto I think it can make the flavour of the salad really good.