Honey Syrup (optional, make ahead): Combine equal parts honey and water (e.g., 1/4 cup honey, 1/4 cup water). Warm in a saucepan until honey and water have mixed together. Can be stored in an airtight container in the fridge for up to 30 days.
To make the Spritz:
To a shaker add 4 sungolds (or regular cherry tomatoes) and 2 sprigs of thyme. Muddle until sungolds have burst and thyme is fragrant. Add lemon juice, honey syrup, gin, and ice. Shake well.
Strain the mixture into a wine glass with fresh ice. Add prosecco, then top with soda water. Give it a stir.
Garnish with sungold tomatoes and thyme sprigs. Sip and enjoy!