In a cocktail shaker filled with ice, mix 2 ounces of gin, 1 ounce of simple syrup (which is equivalent to about 4 teaspoonfuls of sugar) and 1 ounce of fresh squeezed lemon juice.

Shake well to blend and really chill the ingredients.

Strain into a Collins glass filled with ice ( we used 14 ounce tall plastic glasses for the barbecue).

Fill the glass the rest of the way with seltzer, stir and garnish with a slice of orange and a cherry.