I would look at replacing the paninis if they aren't selling, but at this time of year especially you need hot options. Do you have the facilities to make soup? Homemade soup is always a winner, it's cheap and easy to make and can be kept warm in a soup kettle (which cost £30) to be served as soon as they are ordered.
Many years ago I had a unit in the centre of a shopping precinct and I found that baked potatoes with a choice of fillings sold quite well in winter.
Whilst home made soup might be a good seller I very much doubt whether you could get many portions in a £30 soup kettle
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