Make the lemon syrup

• Combine the sugar, water and lemon peels in a saucepan and stir until the sugar dissolves.
• Simmer on low heat for 5 minutes.
• Remove from the heat and let steep for 15 minutes.

Blend the fruit

• Combine the mango, water and half of the pineapple chunks in a blender.
• Blend until smooth.

Mix the lemonade

• Pour the mango-pineapple puree, lemon juice and strained simple syrup into a large pitcher.
• Stir well.

Dilute and adjust

• Stir in cold water (or sparkling water) to reach your desired strength.
• Taste and add more lemon juice for tartness or syrup for sweetness.
• Add the reserved pineapple chunks and serve over ice.