In my experience, preparing mini beef Wellingtons is an enjoyable way to impress guests with a gourmet appetizer that’s elegant yet manageable for home cooks. The key to a successful Wellington is ensuring the duxelles is cooked until almost dry, as this prevents the pastry from becoming soggy during baking. I like to finely chop the mushrooms and shallots, then slowly cook them with cognac until the moisture evaporates, which deepens the flavors. When assembling, it’s crucial to let the seared beef cool slightly before spreading a thin layer of Dijon mustard on each piece. Wrapping the beef in prosciutto not only adds a delicious salty contrast but also acts as a barrier to keep moisture away from the puff pastry. Using egg wash on the pastry edges helps seal the Wellington and gives a beautiful golden finish. Baking at 400°F with the fan or 425°F without ensures the pastry crisps evenly without overcooking the beef inside. Rotating halfway through baking helps with even heat exposure. From personal trials, the 8 minutes per side or a total of 16 minutes works perfectly for medium rare beef tenderloin, but times can be adjusted depending on thickness. Serving these mini Wellingtons warm as appetizers at dinner parties always results in compliments. Pairing them with a light salad or a simple horseradish cream can elevate the dish further. Overall, investing time in preparing a good duxelles and carefully assembling the ingredients yields delightful results each time.