This one took a trial and error to get it to set up. There is no strawberry/mango freezer jam recipe out there so I took the mango recipe off the pkg and added strawberries. Apparently when you do it with mango's you have to use 2 pkg instead of 1 so when I tried it with the 1 it didnt set. So here is what i did.
3 cups mashed/blended fruit (I did a mixture of mango's and strawberries about half and half) dont make it a puree though. Leave some chunks
6 cups sugar (you cannot do less or it will NOT set up!)
1/4 C. lemon juice
2 pkg liquid pectin (i used certo)
Put the fruit in a bowl.
put the sugar in a separate bowl.
Add the sugar to the fruit and mix very well. Let sit for 10 minutes.
Mix the certo and lemon juice together; add to the fruit/sugar mixture. Mix for 3 minutes.
After mixed pour in freezer containers and let set up. Can take up to 24 hours. Mine only took about an hour. Is good in freezer for 1 year. And in the fridge for 3 weeks.