With sharp knife, cube ham; cut each tomato into 8 wedges; cut peppers into 1/2-inch-wide strips; cut onion, squash and zucchini into 1/4-inch-wide slices.
In 12-inch skillet over high heat, in hot salad oil, cook green peppers, onion, squash, zucchini and ham about 5 minutes, stirring frequently. Reduce heat to medium. Add water, basil, salt and pepper; cook until vegetables are tender-crisp, stirring occasionally.
Add tomato wedges, continue cooking until tomatoes are heated through Serve with white rice. Total Cooking time 30-40 minutes.