Cut ham into bite-sized pieces and chop onion.

In a saucepan, cook ham and onion over medium heat for 4-6 minutes or until onion is tender.

Drain and rinse beans, and chop tomatoes into smaller, bite-size pieces (reserving the liquid).

Add beans and tomatoes (including reserved juice) to the saucepan; stir in chili powder. Heat to a boiling, reduce heat to medium-low, then simmer uncovered for 20 minutes or until slightly thickened.

Serve with tortilla chips and grapes on the side.