Marinade the shrimp with Sprite, set aside for 30 minutes. Drain after.
Heat some oil in a pan. Saute shrimps until these change in color. Once orange, take these out of the pan.
In the same pan, melt butter and saute garlic until aromatic. Saute onions until soft. Add in tomatoes and saute for a minute until soft enough to crush.
Season with pepper, sugar, and fish sauce to taste. Mix well before pouring in the egg. Cook for a few seconds before adding back the shrimps. Stir until well coated, for about 1 minute.