Muddle together 5 thinly sliced jalapeños and 4 quartered limes until well mashed.
Add 2 cups of passion fruit simple syrup
and 2 cups tequila in a large pitcher. Add 1/3 cup of passion fruit pulp. Stir well, cover and chill for at least two hours or until very cold.
Fill individual glasses with ice and pour about two ounces of the margarita mix into the glasses. Spoon in some pulp, lime and jalapeno if desired. Top with a splash of club soda and serve.