Sweet 'n Sour chicken (one pot asian-ish delight)

Materials:

• 1-20 oz. can pineapple chunks, juice reserved
  
• 1/4 c. soy sauce
  
• 1/2 c. vinegar
  
• 3/4 c. brown sugar
  
• 2 Tbsp corn starch
  
• 4Tbsp ketchup
  
• 1 green bell pepper, diced
  
• 1 red bell pepper, diced
  
• 1 cup celery, chopped
  
• 1-8 oz can water chestnuts, drained and sliced
  
• 4 cloves garlic
  
• 1-1/2 lb. chicken, cut into small chunks
  

Methods:

1. Cook chicken in a few Tbsp oil just until not pink through, drain off water and transfer to another bowl, and wipe out pan. 
2. Mix corn starch into ketchup until no lumps remain.
3. Add ketchup mixture to pan, and slowly add in soy sauce, vinegar, brown sugar, garlic &  pineapple juice, stirring constantly to avoid lumps.
4. Continue stirring sauce for a few minutes until thickened and bubbling.
5. Add in pepper, celery, chestnuts, chicken and cook until heated through and peppers just start to soften. 
6. Stir in pineapple chunks. 
7. Serve over lots of white rice.