Muddle the blueberries and mint

• Place the blueberries in the shaker.
• Add the mint leaves and crush everything with a muddler or the back of a spoon.

Prepare the lime and rim the glass

• Cut the lime in half and cut one wheel for the garnish.
• Rub the cut lime around the rim of the glass and coat it with salt.

Shake the margarita

• Squeeze the lime juice into the shaker.
• Add the agave nectar, tequila and ice.
• Shake for about 10 seconds.

Strain and serve

• Fill the glass with crushed ice.
• Strain the cocktail over the ice, double straining if you prefer no blueberry bits.
• Garnish with the mint and lime wheel and serve.