Melt the butter in a medium size sauce pan. Stir in flour to make a paste and cook over medium heat for 2 minutes. Stir continuously, don’t allow paste to brown. 2. Remove pan from heat and whisk in lukewarm milk. Return pan to medium high heat and whisk continuously, especially along sides and bottom to prevent lumps.Now, season it with salt and pepper.Keep aside.
Heat the olive oil in a large pan over, add the garlic and Onion cook it till transparency. Add beef and peas cook until Beef is tender.Season with salt and pepper,Add White Sauce mix it well.Cook it for sometime then add milk ,stir it well.When its starts to thickening remove from heat.Add Parmesan cheese give it a mix and garnish with cheese to serve.