1. In a saucepan, dissolve your sugar and water together over medium high heat to make the simple syrup. When dissolved, remove from heat and put 5 stalks of thyme in the pan, let steep for 30 minutes.
2. In a cocktail shaker, muddle together 1 half of the plum, 1 ounce of simple syrup and 2 sprigs of thyme. Transfer released juices to a small rocks glass.
3. Fill rocks glass with prosecco and add a small squeeze of lemon juice.
4. Garnish with fresh plum slices and thyme.

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