Start by adding ½ cup of cold water (or juice/tea) to a small saucepan.
Sprinkle 1 tsp agar agar powder over the water, stirring until completely dissolved.
Bring the mixture to a simmer over medium heat.
Add 1 cup of sugar and stir until fully dissolved.
Continue cooking over medium heat for about 5 minutes until the syrup thickens and turns light yellow.
Pour the syrup mixture into a square or rectangular food storage container.
Let the mixture cool down to room temperature before covering it with a lid and refrigerating it for at least 2 hours.
After 2 hours, run a thin knife around the edges of the container.
Gently lift the jelly from the mold by inserting the knife underneath and pulling it out.
Cut the jelly into 1-inch cubes or any shape of your choice.
Place the cut pieces on parchment paper and let the jelly dry at room temperature for 3-5 days.
Once a hard crust has formed, store the candies in an airtight container at room temperature.
