Place vegetable or chicken stock in a crock pot, add 4 cups water.  If you do not have a crock pot then place it in a soup pan on the stove.  Add lentils to the crockpot and cook on high for about 2 hours or on low for 4 hours.  If you are using the stove top method then bring water to a boil and add lentils and allow to simmer until lentils are soft. 

Add olive oil to a saute pan and add garlic and onions.  Allow to cook until soft.  Add green beans, artichoke hearts and saute until soft.  Add spinach and allow to wilt.  Add tomatoes and sauce and continue to cook until it is at a temperature to your liking.