*I used a frozen passion fruit concentrate watered down at a 1 to 1 ratio. If you can’t find this product, try using passion fruit juice or nectar. The concentrate is very tart, so just taste the juice/nectar first to see how they compare. If they are sweet, you may want to add less simple syrup and up the lime juice
**Please don't buy simple syrup. It's very easy to make at home. Place equal parts sugar and water in a small saucepan (for example, 1 cup of water and 1 cup of sugar), bring to a boil over medium-high heat, and let boil for 1 minute. Take the saucepan off the heat, and let the simple syrup cool to room temperature before using. Done! How easy is that? Simple syrup can be stored in the refrigerator for many weeks.