In a large mixing bowl, combine ground pork, eggs, sugar, MSG, and fish sauce. Mix well until well combined. Set aside.
In a large pan, heat over medium-high heat. Spray with cooking spray or add 2 tablespoon oil. Wait until hot. Then add half your onion and half your tomatoes.
Sauté onion and tomatoes until fragrant - about 1 minute. Add half the egg mixture. Lower the heat to low and allow the omelette to cook for 8 to 10 minutes (or until 80% cooked). Be careful not to burn the bottom.
Flip your omelette (I use a plate to help me flip the omelette) and allow the other side to cook for an additional 3-5 minutes or until fully cooked.
Repeat the steps for the second omelette.
Serve this hot with a side of rice.