Serve with tortilla chips, pasta, scallions, chopped red onion, chopped cilantro leaves, sour cream, shredded Monterey jack or cheddar cheese. The flavor of the chili improves with age; if possible, make it a day or up to five days in advance and reheat before serving.
Heat oil in large heavy-bottomed nonreactive Dutch oven over medium heat until shimmering but not smoking, 3 to 4 minutes. Add onions, bell pepper, garlic, chili powder, cumin, coriander, pepper flakes, oregano, and cayenne; cook, stirring occasionally, until vegetables are softened and beginning to brown, about10 minutes.
Increase heat to medium-high and add half the pork; cook, breaking up pieces with wooden spoon, until no longer pink and just beginning to brown, 3 to 4 minutes. Add remaining pork and cook, breaking up pieces with wooden spoon, until no longer pink, 3 to 4 minutes.
Add tomatoes, tomato puree, and 1/2 teaspoon salt; bring to boil, then reduce heat to low and simmer, covered, stirring occasionally, for 1 hour.
Remove cover and continue to simmer 1 hour longer, stirring occasionally (if chili begins to stick to bottom of pot, stir in 1/2 cup water and continue to simmer), until pork is tender and chili is dark, rich, and slightly thickened.
Add beans and corn. continue to simmer for 30 more minutes. Adjust seasoning with additional salt. Serve with condiments if desired.