Beef Wellington is The Most Impressive Main Dish You’ll Ever Make

Pulse the mushrooms, shallots, garlic, and thyme until finely chopped, scraping down the sides of the bowl occasionally, in 10 to 12 (1-second) pulses. Transfer to a medium bowl. Add the remaining mushrooms to the food processor, pulse until finely chopped, and transfer to the bowl. (Alternatively, very finely chop everything by hand.)