In a shaker about a third-full with ice cubes, add:
2 oz Modern Love gin
1 oz lemon juice
3/4 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.