K, so, this would probably be better fresh, however the Sobeys I was in was sadly lacking in anything resembling a fish department. So I went canned.
3-4 cans small shrimp
1/2 can coconut milk
lemon/lime juice to taste
as many chopped up tomatoes as you want
as many chopped up jalapeno peppers as you want
as much chopped up red onion as you want
salt and pepper to taste
cilantro (the sobeys I was at also didn't have fresh cilantro, so I got cilantro paste. . .I would NOT recommend this).
Mix the shrimp, coconut milk and lemon/lime juice together and let chill out for half an hour. Chop up everything else and mix it all together, seasoning as you like. Toss it in the fridge for another hour. That's it!