Mario Jr Haddad on Instagram: "When I was younger, I remember roast beef with potatoes and gravy being a staple in our home, but what I loved most was the pasta my dad would make the next day with the leftovers. It was pretty simple, really: he’d toss the chopped potatoes into a pan with the gravy and strips of roast beef, then add half-cooked pasta and continue cooking until the pasta was al dente. He’d finish it with a sprinkle of Parmigiano, and there you have it: Spaghetti all’arrosto di man