1. Heat up your pressure cooker and brown the crushed garlic in it.
2. Add cubed beef and onion in it, mix with the garlic. Brown until lightly-browned all over the meat.
3. Add coca cola, soy sauce, balsamic vinegar, garlic powder and stir again well.
4. Now close the pressure cooker and turn the heat to high. When the pressure builds up, turn the gas down medium-low, and time it for about 20 minutes. Remove the pressure cooker from the heat and let the pressure come down naturally, about 15 minutes. Simmer it without the lid until slightly reduced.
If you don't use a pressure cooker, you can still do the same with a pot : After you put all ingredients, bring to a boil, reduce heat and simmer, covered. About 60 mins (instead of 20), or until the meat is tender. Remove the rib and simmer again until sauce is thick.