So if you're like me and find yourself with 15 kilos of Mirabelles at once, your next question must be: what do I do, what do I do??? A tart only needs a couple of handful. I could make jams, but not 15 kilos worth. And most of all, I want to store them for a later use (it helps that I bought a big freezer). So I do what I have been taught to by locals here and it's perfect for what I have in mind! A good Mirabelle Tart during the cold winter.
Give yourself at least an afternoon off for this. It might not look like it, but this does take time!
First, rinse the mirabelles and dry.
With a knife, slice in half and remove the seed.
Transfer the fruits in a single layer on a plate/tray/dish. Put in freezer for at least 2 hours or until the fruit hardens. You can do this in several batches to gain time. This step will prevent the fruit from sticking together when storing them.
When the fruits harden, transfer to a freezer bag. I like to put a kilo of mirabelles per bag. Freeze until needed.