Sorry for the caps lock, just copied and pasted from my recipes.
apparently if you like sweet and sour, you replace coke with tango (not tried that ass not a fan)
DIET COKE CHICKEN
1 X CAN OF DIET COKE
6 TBSP OF PASSATA
2 X CHICKEN BREASTS
ONIONS, MUSHROOMS AND PEPPERS
1X TBSP OF WORCESTER SAUCE
COOK ONION, GARLIC AND PEPPERS FOR A COUPLE OF MINS IN FRY LIGHT, THEN ADD THE MUSHROOMS, THINLY SLICE THE CHICKEN BREAST AND FRY UNTIL GOLDEN. MIX THE PASSATA
WORCESTER SAUCE AND CAN OF DIET COKE IN A JUG AND ADD TO THE CHICKEN AND VEG MIX AND REDUCE DOWN TILL ITS LIKE A STICKY SAUCE.