Tip the raspberries and sugar into a 1.5L sterilised jar. Pour over the gin, seal the jar and swirl around to dissolve the sugar. Store in a cool, dark place and turn the jar once a day for the first week. After 2-3 weeks, strain the gin through a sieve. Pour the gin into mini bottles, and label. The gin will keep its vibrant pink colour for a few months and will be drinkable for a year. Use the boozy raspberries in a cocktail or trifle, or turn them into a granita.