Drain pineapple, reserving juice.
In saucepan mix brown sugar and cornstarch.
Slowly add reserved juice, vinegar, and soy; cook and stir till thick and bubbly.
Cook and stir 1 to 2 minutes more.
On short skewers thread pineapple chunks, franks, pepper squares, and water chestnuts, if desired.
Place on rack in broiler pan; broil 4 to 5 inches from the heat 8 to 10 minutes.
Turn once and baste with soy mixture.
Heat remaining sauce for dipping.