Rinse apples and pat dry. Remove stems and insert a wooden stick into each apple.
Pour about 50 grams (approximately 1-3/4 ounces) of sugar evenly onto a flat plate.
Boil sugar, water, food coloring and vinegar in a heavy saucepan and let boil until a sugar thermometer reads 150°C (approximately 300°F).
Pull pan from the heat immediately. Immerse apples one at a time, rotate and turn until they are completely covered by the syrup, dip into the sugar sprinkled on the plate and let cool. Once hardened, serve.