Wash the cowheel and remove any debris.
Add the cow heel, 3 cups of water (or enough to cover the cow heel about 2 inches), garlic, 2 tablespoons of green seasoning, 1/2 teaspoon salt, and 1 tablespoon lime juice to a deep pot or the inner portion of the Instant Pot.
If using the deep pot: boil the cow heel till tender. It can take up to 25 minutes depending on the quality of the cow heel. You want it tender but not too soft.
If using the Instant Pot: select manual and set the time for 20 minutes. When it beeps, manually release pressure. Check for tenderness.
Wash out the cow heel to remove the oil from boiling.
Add the tender cow heel, cucumber, pepper, onion, chadon beni, the remaining water and lime juice, green seasoning, and black pepper in a large bowl.
Add salt and adjust to taste.
Let sit for at least 30 minutes (or overnight in the fridge) for the flavors to blend.
Serve.