Cook bacon in a large saute pan over medium-high heat until crispy, stirring occasionally. Remove bacon with a slotted spoon and transfer to a separate plate. Set aside. Meanwhile, reserve 1 tablespoon of bacon grease in the saute pan, discarding the extra. Add the onion and jalapeno, and saute for 5 minutes or until the onion is soft and translucent. Add the garlic, and saute for an additional 1-2 minutes until fragrant. Add the beer, beans, brown sugar, oregano, chili powder, salt and cumin, and stir to combine. Continue cooking until the beans reach a simmer. Then reduce heat to medium-low, and continue simmering uncovered for about 15 minutes. When ready to serve, stir in the bacon and lime juice. Then serve the beans topped with fresh cilantro.