In a large pot, combine the mixed berries and mash them slightly with a fork or potato masher to release some juices.
Stir in the sugar, fresh orange juice, orange zest, cinnamon, ginger, nutmeg, and vanilla extract. Let the mixture sit for about 10-15 minutes to allow the sugar to draw out the juices from the berries.
Add the lemon juice and fruit pectin to the berry mixture and stir until well combined.
Place the pot over medium-high heat and bring the mixture to a rapid boil, stirring frequently. Once boiling, continue to cook for about 10-15 minutes, or until the jam thickens and reaches a gel-like consistency.
To test if the jam is ready, place a small amount on a cold plate; if it holds its shape after cooling for a minute, it's done. If not, boil a few minutes longer.
Remove the pot from heat and let the jam cool slightly before transferring it to sterilized jars.
Seal the jars tightly and process in a boiling water bath for 5-10 minutes for preservation (optional). Allow the jam to cool completely.