Look for lemongrass in the herb section of your supermarket. Lemongrass can be sold in long stalks that you chop yourself, short stocks in a plastic container, or as a jarred or bottled paste.

Look for lemongrass that is firm and pale yellow-green with a bit of a bulb at the end. The top of the stalk should look relatively fresh; they tend to dry out quickly so they may not look like they were just harvested but they shouldn't be browned or sad looking.

Stir-fry onion and garlic in wok until tender; add pork, shrimp, lemongrass, and chilies, cooking 5 minutes further, or until pork is done. Add sugar, fish sauce, lime juice, ketchup, black pepper, eggs, noodles, bean sprouts and chives; cook, stirring well for 2-4 minutes, until egg is pretty much cooked and set.