Place cherries in a heat-safe, well-greased 6 x 4 metal pan.
In a blender on low speed, mix together the eggs, sweetener, flour milk, lemon zest and juice and vanilla. Pour this mixture on top of the cherries. Cover the pan with foil sealing well on all sides.
Place two cups of water in the inner liner of your Instant Pot. Place a steamer rack into the inner liner.
Place the foil-covered bowl on the rack.
Cook at high pressure for 20 minutes. Allow the pot to rest undisturbed for 10 minutes, and then release all remaining pressure.
At this point, you could choose to top with a little more sugar, and either broil or air fry the Clafoutis, or serve as is
You can make a clafoutis with berries such as blueberries, strawberries, raspberries etc.