For when you want to just throw a meal together
the key ingredients are readily storable. Galangal, turmeric, and narrow red chiles all freeze very well. Refrigerated lemon grass stays good for at least a few weeks. Shallots and garlic and coconut milk and cream are easy enough to buy and store. This is actually the #1 issue for a cookbook, if like me you cannot so often plan your cooking in advance.