1. Preheat oven to 350 degrees F. Oil your baking dish (I use a 9 inch round pie pan) with olive oil (or use butter).
2. Combine the oat flour, 1/2 cup of muscovado sugar, baking powder, and baking soda in a large bowl. Add the cherries, chopped chocolate, olive oil, rolled oats, and lemon zest and mix well.
3. Add the half and half/lemon juice mixture and mix with your hands until the dough comes together. Add a little more olive oil to bring the dough together, if necessary.
4. Press dough into the oiled dish. Use the heel of your hand to really mash the dough down, so it's firmly in place: this will prevent the cooked scones from crumbling too much. Using a sharp knife, slice the dough evenly into 8 triangle-shaped pieces.
5. Bake for 20-25 minutes minute until the edges start to brown and the scones are cooked through (you can test with a toothpick). Allow to cool before drizzling with the optional glaze. Take care when you remove them from the pan- if not completely cool, they may be crumbly.
6. If making the glaze, combine the 2 tablespoons muscovado sugar with the cacao powder in a small bowl. Adding hot water a little at a time, whisk with a fork until it's a thick but pourable glaze. Taste and add a little more sugar or cacao to your liking, if necessary. Drizzle onto the scones, and allow a few minutes to harden before serving.