Lime Rickeys, once a New York City fountain-drink staple, are traditionally made with lime, seltzer, and cherry syrup.
This homemade version uses fresh raspberries instead, which break down quickly into a syrupy purée and match
just as well with the lime juice. Before they became popular as after-school sodas, a rickey usually meant an
unsweetened cocktail made with whiskey, lime juice, and seltzer. If you feel like combining the best of both worlds,
feel free to add a shot of bourbon or gin to yours.

Makes 2 to 3 servings
6 ounces / 170 g fresh raspberries
1/2 cup / 100 g granulated sugar
1/2 cup / 120 ml freshly squeezed lime juice, as needed
1 to 2 cups / 240 to 470 ml plain seltzer
In a small saucepan over medium-high heat, combine the raspberries, sugar, and 1/2 cup / 120 ml of water. Bring the
mixture to a boil; reduce the heat to medium-low and simmer, stirring often, for 5 minutes.
Remove the pan from the heat and let it cool completely at room temperature. Strain the syrup through a fine-mesh
sieve into a bowl; press down on the solids with the back of a wooden spoon or spatula to extract as much juice as
possible from the berries (you should have about 1 cup / 240 ml of syrup).
For each serving, fill a tall glass with ice. Stir in 2 tablespoons of lime juice and 1/3 cup / 80 ml of the syrup. Top off
each glass with seltzer. Add additional lime juice, to taste.
from "Fruitful"
https://redjacketorchards.com/products/fruitful-four-seasons-of-fresh-fruit-recipes