In a Dutch oven, add the olive oil and garlic and set over medium heat. When the garlic is golden brown, remove it from the pot and add the potatoes. Fry until golden brown, approximately 5-10 minutes, then remove and set aside. Add the lamb to the pot and brown on all sides, approximately 5-10 minutes. Add the onion and also cook until golden brown, another 5-10 minutes. Add the lemon juice and 2 cups of water, cover and let simmer on medium-low heat for two hours or until the meat is tender. Check the pot every-so-often to make sure there’s still liquid in the bottom. If necessary, add a cup of water.