Add the prosciutto with the onions and mix them cooking for a couple of minutes, then raise the heat to maximum, add the wine and continue cooking over high heat stir-frying until all the alcohol has evaporated . Now, lower the heat to medium level, and add the peas, and stir-fry for 5 minutes. When the peas will be well seasoned, add 3 tablespoons of hot vegetable stock, lower the heat at minimum, cover the saucepan with a lid and cook for about 45 minutes, until the peas are cooked but not mushy.