Heat oil in a pan over a medium heat.
Potatoes and carrots should be added at this point. Cook, turning once or twice, until lightly browned. To drain on paper towels, remove from pan.
Remove all except roughly 2 tablespoons of the excess oil from the pan.
Cook the bell peppers for 30 to 45 seconds after adding them. Drain on paper towels after removing from pan.
When the onions and garlic are tender, add them.
Add the chicken, stirring once or twice, and heat until the chicken is gently browned but not fully done.
Cook tomatoes by adding them and pressing them frequently with a back spoon until they soften and release juices.
For about a minute or two, add the fish sauce.
Add water and bring to a boil.
Reduce the heat, cover the pan, and cook for 20 to 30 minutes, or until the chicken is thoroughly cooked and the sauce has thickened to the preferred consistency.
ook the potatoes and carrots with the addition of the stock until fork-tender.
Sweet peas and bell peppers should be added. Cook for 1 to 2 minutes, or until bell peppers are crisp and tender, and green peas are heated through.
Season with salt and pepper to taste. Serve hot.