Pre-heat your oven to 350 degrees F.

Add your grapes to a medium sized sauce pan and heat over medium heat with he lid on, for ~10 minutes until the grapes start to soften. Once you can hear them start to sizzle slightly pop, remove the lid. Leave the pot over the heat and carefully start to mash. The grapes with the back of a spoon. Continue to heat the grapes for another 10 minutes with the lid off, stirring occasionally.

Now, add in the brown sugar, salt, maple syrup, vanilla extract, and lemon juice and stir to combine. Continue to simmer this mixture for another 15-20 minutes until it has reduced down and only a small amount of liquid remains.

Remove the mixture from the stove top and stir in the ground up oats.

While working on the filling (which will take ~40-45minutes), we will make our crust and oat crumb topping.

Gather your crust ingredients (almond flour, oats, sugar, melted butter, egg, salt and vanilla extract) and add them to the bowl of a food processor or your blender. Process them all together until the mixture resembles wet sand (about 15-20 seconds). Then, carefully transfer the mixture to a greased 8 or 9 inch pie plate and press it down and up the sides. Place the pie plate in the oven and bake for 10 minutes. Once done, set it aside to add your filling to.

Add all of the crumb ingredients (brown sugar, cinnamon, oats, almond flour, butter, and salt) to a bowl. Using your hands, mix the topping together, squishing the butter into the mixture as you go. It should start to resemble wet sand.

Pour your filling into your prepared and baked crust. Then, sprinkle the oat crumb mixture on top of the grape filling.

Place your pan in the oven and bake for about 25-30 minutes or until the crumb topping and edges of the crust start to turn golden brown.

Let the pie cool for 20-30 minutes before serving. Enjoy it as is or serve with your favorite low sugar ice cream!