Cafe Panini 2115 Allston Way/Shattuck Ave., in Trumpetvine Court, downtown. Popular with university students and staff, this tiny spot produces simple yet divine open-face sandwiches. Diners order at the counter, then select a seat either in the brick-walled interior or out in a sheltered courtyard--the top choice on a sunny day. Panini are made with magnificent Semifreddi Bakery sweet baguettes and topped with enticing combinations, including a mushroom-pesto-sun dried tomato finished with melted mozzarella. As at Chez Panisse--where this cafe’s owner was once a waitress and then a wine buyer--all ingredients are fresh. Tuna is not from a can. Meats are cooked in-house. Mayonnaise is made from scratch. Herbs are fresh. A soup, a pasta salad, and some delicious housemade desserts are also available.