Smashed Berry Rosè Spritz

Bahan-bahan (6 porsi)

• 1/2 cup fresh blackberries
• 1/2 cup fresh raspberries
• 4 basil leaves ((optional))
• 1/4 cup lemon juice
• 6 ounces silver tequila
• 4 ounces St. Germain ((elderflower liquor))
• 1 750 ml bottle sparkling rosé, chilled
• 2 peaches or nectarines, sliced and cut into star shapes*