Mmmmm, Thanksgiving: turkey, dressing, mashed potatoes, and gravy. Wouldn't you like to have some right now, in May? Indulging your off-season cravings never felt so good -- or as easy on the pocketbook -- as it does at Howard's Cafe on Wednesdays. That's turkey-dinner-special night at this alarmingly unpretentious diner in the Inner Sunset. A humble $7.95 gets you an iceberg lettuce salad with a few red beans and carrot shavings on top, off-the-bird sliced roasted turkey, gravy, stuffing, and a steamed vegetable medley, plus a cup of coffee and a slice of homemade pie. Mom will be jealous.