• 180g flour
• 200g sugar (add more if you like it sweeter)
• 1 teaspoon ground cinnamon
• 2 tablespoons plus more of some solid fat (lard, butter, margarine, they all work fine)

Mix all ingredients by hand, adding more fat as needed; you know you got enough fat there when the crumbles barely hold themselves together, once you press them with your hand.

Batter:

• 1 tablespoon dry biological yeast
• 250ml lukewarm milk; make sure it isn't too hot, otherwise it'll kill the yeast
• 75g sugar
• 300g flour
• 2 tablespoons fat
• zest of a lime, half lemon, or a rangpur
• two eggs
• some vanilla extract
• a pinch of salt
• three bananas, peeled, sliced

1. Mix the yeast, the milk, and one of the tablespoons of sugar. Let it bloom for half a hour.
2. Mix everything else together, then the mix from step #1. You'll get a sticky batter.
3. Transfer the batter to a greased baking dish; preferably a large one, you want the batter to be thinly spread.
4. Let the batter ferment for a few hours; the actual time depends on weather, but it should at least double in size.
5. Add the sliced bananas over it. Then the crumbles. Then bake the thing 180°C, in pre-heated oven, for 30min or so. You know it's done when you stick a toothpick in it and it comes out clean.
6. Let it rest a bit then enjoy.