Crush the saskatoons in a Dutch oven or a large heavy sauce pan. I like to leave some closer to whole than completely crushed to give the jam a little bit of chewy texture. Heat the berries on a medium heat until the juice starts to seep from them.
Add in the sugar and the water and bring to a boil making sure to stir constantly. Once you have brought it to a boil, add in the lemon juice and the lemon peel. Bring to a boil again and cook, stirring frequently until thick, about 15 minutes.
Pour into hot sterilized jars, leaving 1/4 inch (6 mm) headspace. Wipe jar rims thoroughly. Seal and process in a boiling water bath for 10 minutes. Makes about 3 cups (750 mL).