Mom B's Artichokes

Fill a large pot with 1 1/2 inches of water.  Add one tbsp canola oil for each artichoke.  Add one slice lemon or 1 tbsp ReaLemon for each artichoke.  Remove lower leaves. Slice stem 1/2 inch from lower leaves.  Add to water. Bring to a boil, then simmer for 40-75 minutes (depending on the size of the artichokes,) until heart is tender. Grab with tongs and stick a fork in the bottom of stem. If easily pricked or stabbed, the choke is done.