Pineapple Cilantro Serrano Cocktail

Bahan-bahan (1 porsi)

• 1 tablespoon fresh cilantro
• ½ small lime, juiced
• 1 small , round slice of serrano pepper (⅛th to ¼th-inch thick)
• 1 ½ ounces silver tequila
• 3 ounces quality pineapple juice
• agave nectar (optional), to taste