Boil the rice in 1.4 liters of salted water. Cook for about 15 minutes. Dissolve the saffron in very little hot water and add it to the cooked rice. Add the butter in small pieces and the grated caciocavallo cheese and mix well. Pour everything into a baking dish and cool in the pre-cooled blast chiller with the function of blast chilling for about 20 minutes.
Chop the onion and stew it a few minutes in a pan with a drizzle of oil; add the ground, brown it well and blend with the wine. Cook for 5 minutes on high heat, then add the tomato sauce, salt, pepper and cook over low heat and covered for about twenty minutes. Halfway through cooking add the frozen peas.
Cut the fresh caciocavallo into cubes. With your hands wet, take about 120 gr of rice at a time, crush in the center a basin, pour a little sauce, add 2-3 cubes of caciocavallo and close with the rice giving the tip shape.
Mix in a bowl the flour with the water and a pinch of salt avoiding to form lumps. Place the arancini in the batter, then roll in breadcrumbs and fry in abundant hot seed oil until golden.