At first, the deep-fried Twinkies at Long John Silver's were only available as a dessert option on the "Fisherman's Feast" meal deal — after filling yourself with fried fish and hush puppies, you could choose either a strawberry cheesecake or a Twinkie, originally by Hostess but now battered and fried. And even then, they were only available in two test markets: St. Louis and Pittsburgh.But customers started asking for them a la carte, a restaurant spokeswoman tells us.…