Here is a goal: make homemade raisins

How would you accomplish this goal?
Blanch grapes by dropping by the bunch in boiling water for 30 seconds, then transferring into a bowl of ice water. Remove stems. Pat dry with a towel and spread in a single layer onto baking sheets. Place baking sheet in an oven set to warm (180 degrees is ideal) and allow to dry 18-24 hours, turning after 12 hours to prevent sticking. Once dark and wrinkled, remove from oven and allow to cool before storing in an airtight container.