50ml Bombay Sapphire
20ml freshly squeezed lemon juice
1/2 Granny Smith apple (de-cored and diced into small cubes)
2 teaspoons of blackberry jam (or your favourite jam/preserve)
Squash the diced apple in the glass part of a cocktail shaker, add your chosen jam/preserve, lemon juice and Bombay Sapphire then shake well for 30 seconds with cubed ice. Fine strain (using a tea strainer) the resulting liquid into a chilled or frozen martini glass. Serve with the slither of apple or a fresh segment of your chosen jam fruit in a Martini glass.