Hawaiian Haystacks

From what I can gather, this is a Mormon staple, but I'd never had it until I moved to Texas. A few years ago we were in Missouri visiting Mike's brother and his family, and my sister-in-law made her version of it. The sauce for the chicken was UH-mazing. I've made it a few times since and we love it, so I wanted to pass it along.

Chicken / sauce:

3-4 chicken breasts, cooked, cut in small pieces
2 1/2 T soy sauce
1 1/2 c sugar
4 T ketchup
2 c pineapple juice (1 can), pineapple chunks (optional)
1/2 c vinegar
1/3 c cornstarch
1/3 c cold water

Mix together and cook juice, vinegar, soy sauce, sugar and ketchup until sugar is dissolved.
Mix 1/3 c cornstarch with 1/3 c cold water. Add to sauce and stir until clear.
About 10 minutes before serving, add chicken and pineapple chunks (optional)
Serve over white rice

What to add on haystacks:

Shredded cheese (we use cheddar or sharp cheddar), pineapple chunks, slivered almonds, green onions, tomatoes, avocados... There are a bunch of other things too - what else do y'all use?

Also:

Try serving it with THIS salad. It's incredible!!!