Place cheese, tomatoes and jalapenos and their liquid in small heavy saucepan. Set over low heat and cook, stirring often, about 15 minutes until cheese melts and mixture is smooth, or microwave 5 minutes on HIGH in covered, microwave-safe casserole, stirring once halfway through. Serve warm with corn chips or bite-size broccoli or cauliflower florets, celery, carrot or zucchini sticks.