How to Make Ginger Garlic Paste 1. Steps with PicturesStore in the refrigerator. Place the paste in a clean, dry jar. Put it in the coldest part of your fridge, usually at the far back. If the jar is sealed against air and moisture, the paste can last two or three weeks. However, even in the fridge, there is a risk of very dangerous botulinum contamination. If you keep the paste for more than three days, make sure to heat it thoroughly for at least ten minutes to destroy this toxin. The top surface of the paste may turn brown. This is a harmless reaction with oxygen, and not a sign of spoilage unless the color extends below the surface. Keep a clean spoon in the same container as the paste, or make sure every spoon you use is completely clean and dry.