Cut the plums and the ham into cubes and pan-fry them in a pan with beer and a teaspoon of horseradish. Sauté then stir with the Ricotta salata cheese. Now take the stale bread and cut it into very small pieces, season with extra virgin olive oil and rosemary and place them in the oven at 180 degrees for approximately 15 minutes. Once ready, put them into a clean cloth. Close it well and with a rolling pin hit the cloth so as to break the bread as much as possible. Now wash two jars and start to fill them with a layer of bread, one of stuffing and another of crusty bread. Garnish with tarragon and a drizzle of oil.