In a small bowl, stir together 1/8 cup almond flour, 1/8 cup coconut sugar, lemon juice and 1/4 tsp vanilla.
In a baking dish, place peeled and cut pear. Sprinkle the top with your almond flour/coconut sugar mixture.
For the Topping:
In a medium mixing bowl, combine and mix 1/2 cup almond flour, 1/4 cup coconut sugar, almond extract, and a pinch of salt. Add 1/2 stick diced cold butter to the mixture and mix everything with your hands until butter is pea-sized.
Add 1/4 cup gluten-free oats and use your hands to make large crumbs, rubbing the mixture between your fingers. Add 1/4 cup sliced almonds and toss to combine.
Spread the crumble topping evenly over the pears, and sprinkle with the second 1/4 cup sliced almonds. Bake uncovered at 350˚F for 35 - 40 minutes, or until almonds are golden brown and pear juices are bubbling at the edges. Let the crisp cool at least 15 minutes before serving.