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Peel and mince finely. Use a fine grater or a food processor to mince the ginger. Alternatively, use an ice cube tray. Keep the layer as even as possible. Repeat until all of the minced ginger has been used up. Place the sheet or tray inside the freezer. Let freeze. Lift off the frozen portions of the minced ginger. Transfer each portion to either a resealable bag or an airtight container. If using a bag, try to expel as much air as possible before resealing. Use as needed. This ginger will keep for up to six months.
Select a suitable piece of ginger. Line a baking sheet or tray with parchment paper or foil. Spread a teaspoon or tablespoon amount at a time of the minced ginger across a part of the parchment paper or foil. Place a sheet of plastic wrap gently over the top of the spread ginger. Remove from the freezer. Place back in the freezer.