A quick bit of market research. If you went into a cafe/bar at lunchtime for a panini, what filling would you want?

If I went in just once then probably something in the Ham & Cheese line - if I went in regularly I'd want a selection. Last Saturday Mrs INJ and I shared a Mushroom and Gorgonzola and a Tuna Melt.

[Phil] Generally, anything containing no cheese and not full of glop. Sweet Chilli Chicken, Ham and Piccalilli and Smoked Mackerel and Salad are the things I've had recently at a cafe I often go to for lunch at the weekend. The Ham (when they have it) is proper ham, of course, not vacuum-packed water-filled slices of reconstituted mechanically recovered meat. The Piccalilli might also have been homemade, not poured from a jar of clonmult.

[Raak] Salad in a panini? I assume that Phil's intending these to be served hot, whereas your suggestions sound like excellent sandwich fillings.

Marvellous Raak. I love the "BECCLES (pl. n.) The small bone buttons placed in bacon sandwiches by unemployed guerrilla dentist." It reminds me of two things about my younger sister. She had a throry that you only get those buttons in bacon when there's a Labour government. She also had a lot of difficulty one weekend evening in the pub (many years ago, of course) when a handsome young man told he he was an 'armydentist'. She tried to fasten the two words together, like 'taxidermist', and couldn't understand what the job was.
Re; panini ham'n'cheese is the default filling, but I'd also go for perhaps hot roast beef with wholegrain mustard, and the smoked mackerel sounds good too. Can you lift the lid afterwards to stuff some watercress in?