Thanks to Chinese Restaurant Syndrome, MSG probably has some of the worst PR in the food world. However, since many of the myths surrounding it — such as causing migraines and being very high in sodium — have been debunked, it's gaining popularity.
In reality, MSG works as a flavor enhancer, helping to boost the umami of dishes. It is found naturally in many foods like tomatoes or cheese, but it can also be made into flakes similar to salt that can be added to food in the cooking process.
You'll likely find it in small bags or a little dispenser like this, which was around £2, or $3. Just a tiny amount can make all the difference in enhancing the flavor of dishes like egg-fried rice.