Toffe apples

Ingredients for the toffe apples
4 apples, washed
225g/7.9 oz brown sugar
110 ml/3.9 oz water
1 tsp vinegar
25g/0.9 oz butter
Utensilis for the toffe apples
4 wooden skewen
saucepan
wooden spoon
tray lined with parchment paper
AND NOW BON APPETIT