Prepare the Tomatillo Sauce. Add the tomatillos, serrano, jalapeno, garlic, garlic, salt, and half of the cilantro to a blender or food processor and blend until smooth. Set aside.
In a large pot or Dutch oven, cook the chopped bacon over medium heat until crispy, about 5 minutes. Remove with a slotted spoon and set aside on a paper towel-lined plate. Leave the rendered fat in the pot.
Season the beef pieces with salt, black pepper, and ground cumin.
Increase the heat to medium-high and add the seasoned beef to the pot with the bacon fat. Sear 2-3 minutes per side until browned on all sides.
Pour in the blended tomatillo verde sauce and beef broth. Stir to combine.
Bring to a boil, then reduce heat to low. Cover and simmer for 30 minutes, or until the beef is tender to your liking. You can simmer longer if desired.
Stir in the cooked pinto beans and half of the crispy bacon. Simmer for an additional 10 minutes.
Stir in the remaining chopped cilantro and lime juice. Adjust seasoning with salt and pepper as needed.
To Serve. Ladle the stew into bowls. Garnish with the reserved crispy bacon, chopped cilantro, diced onion, sliced radishes, crumbled queso fresco, and sliced avocado. Serve with lime wedges on the side.