This refreshing cocktail blends the tartness of fresh blackberries with the boldness of tequila and lime. 

Ingredients:
- 2 oz tequila 
- 1 oz lime juice 
- 1 oz agave syrup 
- 5-6 fresh blackberries 
- Salt (optional) 

Directions:
1. Muddle blackberries in a shaker.
2. Add tequila, lime juice, agave syrup, and ice to the shaker.
3. Shake vigorously for about 10 seconds. 
4. Strain into a glass filled with ice. 
5. Optionally, rim the glass with salt before pouring the margarita. 
6. Garnish with a few more blackberries and a lime wedge. 

Enjoy the fruity and slightly tangy flavors of this delicious Blackberry Margarita!