• Start by blending the watermelon separately until smooth. Strain if desired for a smoother texture. Repeat the same process with the pineapple.
• Add both juices to a large pitcher and stir together. Add fresh lime juice, lemon juice, and brown sugar simple syrup to taste. Mix until fully combined.
• Run a lime wedge around the rim of your glass and dip it into tajín seasoning. Fill the glass with ice and pour the fresca over top.
• Serve immediately while ice cold.

For simple syrup

• In a small pot, combine brown sugar and water and bring to a light simmer, stirring until the sugar has completely dissolved
• Cool completely before adding to fresca