Heat palm fat in a large saucepan over medium-high heat. Add chopped onions and garlic, cook for 3 minutes until softened. Add minced beef and beef cubes, stirring frequently, and cook for 8-10 minutes until well browned. Add leek, carrot, red pepper, and whole chilli pepper, stir well, and cook for 2 minutes. Stir in tomato paste and cook for 1 minute. Pour in port wine to deglaze the pan (scraping up browned bits), add canned tomatoes, tomato sauce, and vegetable stock. Stir in gypsy sauce, oregano, cumin, allspice, coriander, Parisian pepper, hot paprika, sweet paprika, goulash spice, chili powder, and cayenne to taste. Add espresso, cocoa powder, and cane sugar. Bring to a simmer, reduce heat to medium-low, and cook uncovered for 1 hour 30 minutes, stirring every 10-15 minutes.
Add drained kidney beans and corn, stir well, and simmer gently over medium-low heat for 20 minutes. Season to taste with salt and pepper.
Remove from heat, stir in dark chocolate pieces and sour cream until melted and combined. Add sambal oelek or tabasco to taste if desired.
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