Preheat the oven to 375 degrees.
Put the diced pears, plums, and apples into a glass baking pan/dish. (I used a 35x23 cm european sized glass baking dish... but I measured it and it seems like this could be around 11x 9 inch if you measure just the part that holds food). Cover the fruit in 1 tsp of cinnamon and 1 Tbs of honey and mix.
In a large bowl, mix 2 cups of almond flour, 2 tsp of cinnamon, 2 Tbs melted coconut oil, and a scant 1/2 cup of maple syrup together until completely mixed.
Pour the crumble topping on top of the fruit and evenly pat it down using the back of a spoon or a rubber spatula. Don't worry if all of the fruit isn't covered.
Cook for 25- 30 minutes. Check on it around the 25 minute mark to make sure it hasn't overcooked. You want the top to be golden and a bit hardened, but the inside to be soft.