Polpettone alla Toscana Ripieno di Uova Sode e Verdure

Soak the stale bread in the whole milk until fully saturated, then squeeze it firmly so that only the softened crumb remains, with no excess liquid — milk left in the bread will slacken the mixture and prevent the roll from holding its shape. Combine the pork and beef mince in a bowl, add the beaten egg and the squeezed bread, and work the mixture by hand until fully cohesive and uniform. Season with salt; the mixture is ready when it holds its shape cleanly when pressed.

Season the blanched, thoroughly squeezed spinach with salt and fold in the grated Parmigiano, squeezing the spinach as dry as you can so that the moisture does not steam the meat from within and loosen the roll. Lay a large sheet of cling film on the work surface and press the meat mixture into a flat, even rectangle on the film, roughly 25 cm × 20 cm and of uniform thickness throughout — any thick patches will crack during rolling.

Arrange the seasoned spinach across the centre of the meat rectangle, leaving a clear border of at least 3 cm on all sides so that the meat can seal cleanly over the filling without it spilling through the seam. Lay the hard-boiled eggs end to end along the centre of the spinach. Using the cling film to assist, roll the meat tightly and evenly over the filling, pressing firmly to expel air pockets, then seal both ends by pressing the meat together — the roll must feel compact and dense, with no visible seams or gaps, because this is where the dish lives or dies: a loose roll will fracture in the braise and the cross-section will be lost.

Unwrap the polpettone from the cling film and allow the surface to dry for a minute or two before browning, so the meat does not steam against the pan and the crust forms quickly rather than stewing. Heat the olive oil in a wide, heavy-based pan over medium-high heat and brown the polpettone on all sides, turning with two spatulas, until a firm, even crust has formed. The surface should be deep golden-brown and should release cleanly from the pan — that crust is what holds the roll together through the braise.

Remove the polpettone and set it aside, then sweat the chopped onion, carrot, and celery in the residual fat in the same pan over medium heat until softened and beginning to colour, drawing on the caramelised fond left by the meat so that it becomes part of the sauce rather than burning in the bottom. Add the tomato and stir to combine, then return the polpettone to the pan and pour the white wine over it, bringing everything to a gentle simmer. The wine should foam briefly as it meets the pan.

Reduce the heat to very low, cover the pan, and braise for 45 minutes, turning the polpettone once at the midpoint with care, keeping the liquid at a barely perceptible murmur throughout — a rolling boil will force its way through the crust and break the loaf open before it can set. The gentle, steady heat is what allows the centre to cook through without the outside tightening and splitting. When done, a skewer inserted at the centre for ten seconds should emerge hot to the touch.

Remove the polpettone from the pan and rest it uncovered for a minimum of 10 minutes before slicing, so the juices that have been driven to the surface during braising redistribute back through the meat and the slices hold together cleanly rather than crumbling. Meanwhile, reduce the braising liquid over medium heat until it thickens to a coating consistency. Slice the polpettone into rounds of approximately 2 cm — each slice should reveal a clean concentric ring of egg white around the golden yolk, set within the green spinach and the meat.