Season the partridges inside and out, and put the thyme sprigs in the cavities. Place the prosciutto slices over the breast and legs of the birds, and tie on with string.
Drain the soaked porcini, straining and reserving the liquid. Rinse the porcini well under cold running water.
Heat 2 tablespoons olive oil in a small frying pan and gently cook the garlic until light brown, al