This refreshing cocktail is the perfect balance of sweet and sour with a hint of floral notes. 

Ingredients:
- 1.5 oz of vodka
- 0.5 oz of St-Germain elderflower liqueur
- 0.5 oz of freshly squeezed lemon juice
- 0.25 oz of lavender syrup (you can make your own by boiling water, sugar, and lavender buds together and then straining the mixture)

Instructions:
1. Fill a cocktail shaker with ice.
2. Add all the ingredients into the shaker.
3. Shake vigorously for about 10 seconds.
4. Strain the mixture into a chilled martini glass.
5. Garnish with a lemon twist or lavender sprig.
6. Enjoy your Lavender Lemonade Martini!