For the crust:

1. Put the oats in a food processor and pulse to break up a bit.
2. Add cocoa powder, syrup, coconut oil, and salt. Process until mixture forms a ball and comes together.
3. Transfer dough to a tart pan and pat out using fingers or the bottom of a cup until crust is spread evenly. Refrigerate while you make the filling.

For the Filling:

1. Place all ingredients in a food processor (or blender, or you can do this by hand) and puree or pulse until well combined and there are no lumps remaining.
2. Spread filling over the crust and smooth out with a spatula or knife.

For the Topping:

1. If serving within a few (4-5) hours, place the berries on top of the chocolate filling in any design you like, and chill for at least 30-40 minutes in the refrigerator to allow filling and crust to set. Store tart in the refrigerator until ready to serve.
2. If you are making this ahead of time (more than 4-5 hours before eating), refrigerate the tart (crust and filling). When ready to serve, top with berries. Store tart in the refrigerator.
3. If you are making this far in advance, you can make and freeze the tart without the berry topping and store in the freezer in an airtight bag up to 2-3 weeks. Thaw in the refrigerator before adding berries and serving.