Put your pot of water on for your tortellini.
Get another deep pan. Your going to put your shallots, garlic, butter and olive oil in; you are going brown up your veggies than your going to add chopped prosciutto and brown that up as well.
To this your going to add chicken broth and the peas and let them simmer for a few minutes
By this time your water should be boiling. Your going to put your tortellini in the boiling water and stir as they cook. Remember you want them to be a little "al dente" having it a little under cooked.
In the meantime your pea and prosciutto have been cooking. Now your going to ladle them out and put them in a bowl and set them aside.
To this pan your going to add your sifted flour and just a little of your half and half mixture. Your going to keep your pan on low and slowly keep adding your half and half mixing as you continue to stir. until all incorporated. Now the milk mixture should start thickening.
Next your going to add your grated Locatelli cheese and continue stirring and incorporating it.
Next your going to add in your ricotta cheese, also your going to add your salt and pepper as well; stirring to combine all your ingredients.
Next your going to add back in your peas and prosciutto mixture.
Lastly your going to add in your cooked tortellini, stir to incorporate all the flavors. Now its time to call everyone to the table, buon appetito!!