step 1
Juice half of the pineapple, use the juice for the base of the sauce in step two and then the leftover chunks in step 4
step 2
Add water, vinegar, pineapple juice, ketchup and sugar into a pan.
step 3
Dissolve cornflour in 1 tablespoon water and add to pan.
step 4
Continuously stirring, bring all ingredients to the boil, then turn down to simmer and add pineapple, before stirring for another 2 minutes.