Method

To prepare the prawns 

1. Defrost the cooked prawns by placing them in a colander in a bowl in the fridge
2. When defrosted place on some kitchen paper to remove excess water
3. Put the prawns in a bowl and dress with half a tablespoon of extra virgin olive oil and half a tablespoon of lemon juice

To make the Marie Rose sauce 

1. In a clean bowl, add all the ingredients and whisk
2. Season with cayenne pepper and a pinch salt (optional) 

To make the salad garnish   

1. Peel, de-seed and dice the cucumber
2. Quarter the cherry tomatoes
3. Finely dice the spring onion 
4. Finely chop 1 baby gem, and cut the other one in quarters 
5. Place the lettuce in a clean mixing bowl. Add the chopped cucumber, cherry tomatoes and spring onions
6. Garnish with chopped mint and a squeeze of lemon