Cut the chicken breast into small cubes, then mix with the soy sauce and one tablespoon of cornstarch. Let it marinate for 10 minutes.
Cut the bell peppers and onion into larger cubes. Drain the pineapple chunks.
Heat 2 tablespoons of oil in a skillet over medium-high heat. Cook the chicken breast for 5-6 minutes, or until golden brown. Set aside.
In the same skillet, sauté the onion and bell peppers for 3-4 minutes, then add the pineapple.
In a bowl, combine the tomato paste, vinegar, sugar, ginger, salt, pepper, and water. Whisk in the remaining cornstarch until smooth.
Pour the sauce mixture into the skillet and stir to combine with the vegetables. Cook for 3-4 minutes, or until the sauce thickens.
Return the chicken breast to the skillet and toss to coat in the sauce. Cook for another 2-3 minutes to allow the flavors to meld.
Serve immediately over freshly cooked rice or steamed jasmine rice, and garnish with fresh green onions or sesame seeds.
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