In a shaker about a third-full with ice cubes, add:

2 oz Modern Love gin
 oz lemon juice
 oz simple syrup

Shake well to blend and chill, then strain into a Collins glass filled about two-thirds of the way up with cracked ice. Top with:

1 oz seltzer

Stir lightly to blend and garnish with a lime (or orange or lemon) wheel and cherry pierced on a cocktail pick. Optionally, serve with a straw.