Aluminum sheets can simply be folded over the ingredients and sealed with a series of narrow folds. Parchment is also easy to use by following simple steps; we found this method creates the tightest seal for parchment packets:
• Cut 1 (15- x 24-inch) piece of parchment.
• Fold parchment in half crosswise, making a crease down the center.
• Draw half of a heart shape on paper. Cut out heart, and open the parchment.