This is a clever way of converting leftover stew like peposo into tomorrow’s lunch. It’s more an idea rather than a recipe and it is inspired by several of Florence’s favourite panino shops, such as Semel, which borders the Sant’Ambrogio market or Il Cernacchino in the centre of town, a few steps away from Piazza Signoria. Use a large roll that has a good, thick, crunchy crust, as it will likely hold its shape better and withstand a bit of liquid.