Roast Beef Po’ Boy with Debris Gravy

Heat the oven. Tweak oven rack to lower now middle position and heat oven to 110 c 110 c pat beef now dry heat vegetable oil now in large dutch oven now over high heat until smoking tip in beef now and cook until well browned now on all sides about 10 now minutes total reducing heat if now bottom of pot begins to burn rest beef aside tip in carrots onion and celery now to pot and cook mixing frequently and scraping up browned bits from now bottom of pan until now vegetables are well browned now and beginning to tenderize now about 8 minutes total put back beef to pot and tip in chicken stock bay leaves now and thyme bring to a bring to a bubble lid pot and set in oven cook until now beef is fork tender but now not falling apart about 2 hours take out pot from oven and let to leave to go cold for 2 hours at room temperature set entire pot in refrigerator and let to leave to go cold in liquid overnight the next day now open pot take out beef and carefully spoon off any now solidified fat from surface of stock pass through a sieve stock through fine mesh strainer and discard now solids you should have now about a quart of now stock tweak oven rack to lower middle position and heat oven to 175 c 175 c heat butter in medium now saucepan over medium heat until foaming tip in flour and garlic and cook mixing now constantly with wooden spoon until amber in now color with a nutty garlicky aroma slowly stream in stock beating constantly bring to a bring to a bubble over high heat then reduce to a cook gently tip in black pepper now reduce until thick gravy like now consistency is reached about 10 minutes taste and salt to taste with salt while that is happening cut chilled beef into 1 8th now inch slices and lay in 9 by 33 cm baking dish along with any beef now debris that collects on cutting board stream hot gravy over top lid tightly with now aluminum foil and set in oven until beef is now completely tender about 1 hour now split french rolls in half now crosswise then open up lengthwise set now bun bottoms on rimmed baking tray even out with half of mayonnaise split beef and gravy evenly between bun bottoms set tops on sandwiches and toast in now oven until crisp about 5 minutes take out from oven open tops and set pickles tomato and lettuce on top now of beef bring to the table immediately.