Dice the tomato and onion into small pieces.
Cut the chicken breast into bite-sized pieces.
Add olive oil to a pan, then sauté the onion and chicken breast together.
Add the tomato and simmer until it thickens into a sauce.
Blanch the konjac noodles in boiling water and drain well.
Mix the sauce and the konjac noodles together and stir-fry for another 2-3 minutes.
Season with salt and pepper to taste.