To make the syrup, dissolve the sugar in water in a pot over medium heat. Reduce heat and add the raspberries, muddling them to make a pulp. Strain the syrup, so you don't get any berry mush or seeds.
For the drink, shake all ingredients together in a shaker with ice. The egg white is optional; it makes it nice and frothy. Strain into a chilled glass, and serve!
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