Combine sugar and water in a saucepan over medium heat.
Heat up mixture, stirring frequently to dissolve sugar.
When sugar has dissolved and mixture is starting to bubble around the edges, stir in the hibiscus flowers and turn off the heat.
Let sit for 15 minutes, then strain into a measuring cup.
After it cools, pour into a jar or swing-top bottle, and store in the refrigerator for up to 2 weeks.
Notes
Be careful not to oversteep your syrup. If you continue to boil the syrup after the hibiscus flowers have been added, or you let the flowers steep for 30 minutes or more, you might find that your syrup has a slightly bitter flavor. Once you have this method down, get creative by adding spices. Add whole cinnamon sticks and cloves, dried or fresh ginger, or even a vanilla bean to your sugar mixture. Keep them in the syrup until you strain it.