1. Place all the berries in a very large pot with the sugar. 2. Cook long enough for the cranberries to break. 3. I use a potato masher at this point and mush up all the fruit as the frozen strawberry pieces can be quite large. There will be a lot of foam, most of it will settle down but if there is a lot, I start skimming it off just before adding the pectin. 4. Add the pectin. 5. Bring it to a full rolling boil and stir continuously for 2 minutes. 6. Skim off any foam that has come to the top. 7. Remove from heat and let cool 5 minutes. 8. Pour into clean, sterilized jars, leaving 1/4" at the top of each jar. 9. Put on caps and process for 15 minutes in a hot water bath. 10. Let cool upside down overnight, making sure each jar is closed securely. 11. Note: If you do not have a pot large enough to hold all the berries (the pot needs lots of space when those berries start bubbling), halve the recipe and use 2 pouches liquid pectin.