I've started experimenting with making cocktails at home, after a fair few years hiatus from making them behind a bar. Generally I like a simple classic cocktail, which makes recreating them easy - as long as you can get the ingredients.
One of the ingredients a lot of cocktails use is a sugar syrup. You can buy it - it's usually called Gomme - but to be honest, making it at home is a lot easier when you're having an impromptu play around, and it's so much cheaper.
200ml caster sugar
Place the sugar and water into a large saucepan, and warm on a medium heat. Stir gently until the sugar is dissolved and the liquid begins to simmer.
Remove from the heat, and pour into a sterilised jam jar or glass bottle.
Allow to cool before use.
You can experiment with the sugars - dark sugar works really well with a rum cocktail for example, but will change the colour of your cocktail if it's a paler liquid.