In a large, deep skillet, heat the olive oil. Add the chopped onion and minced garlic and cook over moderately high heat, stirring frequently, until softened, about 5 minutes. Add the veal, season with salt and pepper and raise the heat to high. Cook, stirring occasionally, until the veal is no longer pink and any liquid has evaporated, about 8 minutes.

Add the white wine to the skillet and boil over high heat until nearly evaporated, about 5 minutes. Add the chicken stock, thyme, rosemary and capers and simmer over moderate heat until the liquid is reduced by half, about 10 minutes.

Meanwhile, cook the orecchiette in a large pot of boiling salted water until al dente. Drain the pasta well and add it to the skillet along with the Parmigiano-Reggiano cheese, chopped parsley and butter. Cook over moderate heat, stirring frequently, until the sauce is thick and creamy, 1 to 2 minutes. Transfer to bowls and serve right away.

MAKE AHEAD The veal sauce can be covered and refrigerated overnight. Rewarm the veal sauce before serving.