Beef: Stir Fried Pineapple

Another lovely dish. Everyone should try this but need to buy really tender beef.  Got the recipe from Chef Wan's Simply Sedap.
The ingredients:
3 tablespoons peanut oil
3 cloves of garlic (finely chopped)
thumb-sized ginger (peeled and sliced)
2 tablespoons hot bean paste
1 red capsicum (diced)
beef stock granules
500 grams beef rump steak (finely diced)
2 tablespoons oyster sauce
1/2 cup plum sauce
2 teaspoons sugar
salt
freshly cracked black pepper
280 grams diced pineapple
coriander leaves (chopped - for garnishing)

How? Fry garlic, ginger and hot bean paste
Then, add in the capsicum and beef stock granules.
Pour in the beef and the rest.