Totani Ripieni
Neapolitan stuffed squid in tomato sauce -- patience required, tender result
The totani ripieni belong to the category of stuffed things that the Neapolitan and Campanian kitchen makes with particular skill -- the calzone, the braciole, the peppers imbottiti, and here the squid. Large squid bodies filled with a mixture of stale bread, eggs, Pecorino Romano, garlic, and parsley, sealed with toothpicks, browned lightly, and then simmered slowly in tomato sauce for forty-five to sixty minutes until the squid is tender and has absorbed the flavor of the sauce and the filling has set into something cohesive and savory. Sliced into thick rounds and served with the sauce, the totani ripieni look exactly like what they are: a serious dish that required care and time and will be better for both.
The squid -- totano specifically, which is slightly larger and more robust than the common calamaro and better suited to stuffing -- must not be overstuffed. The filling expands during cooking and the squid body contracts slightly; overstuffed totani burst open during browning or during the simmer, releasing the filling into the sauce. Generously filled but not packed, the toothpick closure held firmly, and a gentle brown rather than an aggressive sear -- these are the conditions for totani ripieni that arrive at the table intact and looking as they should.
Squid muscle contains a high proportion of collagen cross-links and a particular protein structure that responds to heat in an unusual way: at cooking temperatures up to about 60C, the proteins denature and the squid becomes tender. Between 60C and about 80C, the proteins rapidly cross-link and contract, producing the characteristic rubberiness of overcooked calamari. Above approximately 85-90C, sustained for 40-60 minutes, the extensive collagen in squid connective tissue begins to convert to gelatin and the muscle fibers, already fully contracted, begin to soften as the gelatin dissolves and lubricates them. This is why squid can be either very briefly cooked (2-3 minutes) or very long cooked (45-60 minutes) -- both produce tender results -- but the intermediate range (10-30 minutes) produces tough, rubbery squid. The stuffed totani, simmering in tomato sauce for 45-60 minutes, are in the correct long-cooking zone.
The recipe

Buon appetito.