In a large pot, heat the olive oil over medium heat.
Add the finely chopped yellow onion and red bell pepper, sautéing for 4-5 minutes until the vegetables are tender.
Add the lean ground beef to the pot, browning it thoroughly while using a spoon to break it into small crumbles.
Stir in the minced garlic, chili powder, ground cumin, sea salt, and black pepper, cooking for 1 minute until fragrant.
Pour in the kidney beans, tomato puree, and water, stirring well to combine all ingredients.
Bring the mixture to a gentle boil, then reduce the heat to low and cover the pot.
Simmer for 15-20 minutes to allow the flavors to deepen and the sauce to thicken.
Ladle the hot chili into a bowl and serve immediately.