Mix together oranges and strawberries. Add sugar and lemon juice and mix well. Let stand for at least 20 minutes. Put water and pectin together in a saucepan and mix thoroughly.
Bring mixture to rolling boil that cannot be stirred down and boil for 3 minutes.
Remove from heat and mix pectin solution into fruit, stirring constantly for about 3 minutes. Ladle into sterilized jars, with clean rings and new lids and seal.
Let set overnight. Store in freezer. Makes 6 half-pint jars.