Prawn and Tomato light meal

This was actually dinner for my son - his own creation. I thought it was worth posting as I figure it would be a lovely lunch or light meal (comes in at just 200 calories):

85g King Prawns (about 8) = 102
1tsp olive oil = 39
Salad tomato = 13
18g Cocktail gherkins = 5
1 Tbs Light mayonnaise = 42

If the prawns were grilled and only half a Tablespoon of mayo used then that would save 40 calories, which could increase the number of prawns for an even better low-fat protein rich meal.