Wash beef shanks and place into your instant pot. Add sliced onions and bay leaf. add 8-10 cups of water. Lock the lid and put IP to high pressure for 40 minutes. Nature release to avoid foam splashing.
Open lid and add chopped potatoes, sliced chayote and zucchinis, carrots, corn, cabbage and sliced tomatoes. Add salt and pepper to taste.
Lock the lid and push high pressure setting for 4 minutes. Quick release.
Serve with chopped cilantro and quartered lime.
Notes
For Weight watchers: myWW green plan 5 points,myWW blue plan 4 points,myWW purple plan 2 points per serving (all calculations are done by adding ingredients to Weight watchers app calculator)