Sweet and Sour Fish

Recently, whenever i eat out with my parents, we often order sweet and sour fish for our grandma, soft enough for her to chew and great flavour, which is a big hit for all ages. 
I must admit sweet and sour is not my favourite choice of sauce, but now and again when its on the table... its really is tasty!
I also think its a perfect thing to have on a summery day, and something different on the menu. So asked my mum how to make it, and here i tried to recreate it.

Finally mastered and look like something you find in a chinese take-away.

2-4 cups Veg Oil for deep frying
1lb/450g Fish Fillet (cod, haddock)
1 Tbspn Ginger, finely chopped
2 Onion, chopped
1 cup Mixed Peppers, chopped
4oz Mangetout (optional - blanch in hot water for a couple mins, then plunge in cold water)
half of tin pineapple, chopped

Marinade:
1 tspn salt
1 Large egg white
1 Tbspn cornflour

Sauce:
1 Cup Chicken Stock
1Tbspn Light soy sauce
1Tbspn Chinese rice wine or dry sherry
2Tbspn Tomato paste (i used tomato ketchup)
3Tbspn Rice vinegar
3Tbspn Granulated sugar
1Tbspn Cornflour mixed with 2Tbspn water

Method:

1) Rinse the fish fillets and pat dry. Cut into 2inch sqaures. Add the fish to the marinade ingredients, using a pair of chopsticks to mix in the ingredients and adding the cornflour last. Marinate the fish for at least 15 minutes.
2) While the fish is marinating, prepare the sauce and vegetables. In a small bowl, mix together the chicken broth, soy sauce, rice wine, tomato ketchup, vinegar and sugar. In a separate small bowl, dissolve the cornflour in the water.
3) Heat the oil very hot in a wok, then gentlely add the marinated fish cubes, and let it deep-fry until they are golden brown. Repeat it a few times, if you got quite alot of fish, because dont want stick together. Remove and drain on paper towels.

4) Drain oil through a sieve into a bowl, then add 2 tablespoon of oil into the wok. Add the ginger, onions and stir-fry for 1 minutes. Add the mixed peppers, mangetout, pineapple chunks and stir-fry for a further minute.
5) Add the bowl of mixure of sauce, and let it mix well with the vegetables. Add the fish, and mix well for a couple of minutes and ready to serve.

Tip:
Open your windows, and turn on your extractor fan, and maybe close your kitchen door so dont set the smoke alarm, when deep-fry.

This was my first attempt, practice makes perfect, and cook quicker.

Happy Cooking!