Put 3 or 4 raspberries into the mixing glass and use the flat part of a spoon to muddle the raspberries until they are pureed. Add 50ml or 2 oz of Vodka and Peach Puree. Fill up the rest of the mixing glass with ice cubes. Top up with guava juice. The Miss Collins needs to be shaken hard. Put the top half of the cocktail shaker on. Slap it down firmly to seal. Hold the top and bottom, stand at an angle and shake vigorously over your shoulder for about 20 seconds. When there is condensation on the outside of the shaker and it feels very cold, then it's mixed. Place two raspberries onto a cocktail stick as a garnish. Add two straws, and stir.