Prepare 24 hours before use to let flavor emerge. Mince 5 sprigs of fresh rosemary (no stems). Add 1 cup of Kosher salt. Mix well and store in a dry container.
Add 10 sprigs of rosemary and 5 bunches of fresh thyme into 4 cups of water. Bring to a boil, then turn down to low and simmer for 10 minutes. Reduce to about one-third of the original mixture, then add 2 cups of sugar. Stir well to dissolve. Cool, strain and set aside.