2cupsfresh squeezed grapefruit juiceabout 3 medium grapefruits, strained to remove any pulp
2packetsabout 4 1/2 teaspoons unflavored gelatin
1cupseltzer/soda water
2tablespoonsagaveor honey
Instructions
Add 1 cup of grapefruit juice to a medium bowl and sprinkle gelatin on top to soften. Let sit about 5 minutes then stir.
Add remaining cup of grapefruit juice to a small sauce pot with the agave (or honey) and bring to a low simmer. Stir until sweetener is dissolved into juice.
Pour the hot juice mixture into the bowl with the juice and gelatin slowly and whisk until well combined.
Add the seltzer and continue whisking until smooth and combined.
Pour the mixture into jars or a pan (if you want to cut into cubes after it's set) and place in the refrigerator for at least 4 hours or until set.