If you love Spam® like my family does, then this is a recipe for you! Super quick and easy. Put on a bed of rice and you've got yourself a meal. My mom made this when I was a kid and I still make it today.
Combine juice from canned pineapple, water, brown sugar, vinegar, and cornstarch in a saucepan; bring to a boil and cook, stirring constantly, until sauce is thickened and you notice a change in color, about 5 minutes.
Stir pineapple chunks, green bell pepper, and luncheon meat into sauce and simmer until heated through, about 10 minutes.