Thinly slice or chop the plums, discarding the pits. Toss with the sugar, seeds of the vanilla bean, and the Clearjel or thickener of your choice. Set aside.
Whisk the flours and sugar together and then add the butter, breaking it up into smaller pieces, along with the extract. Use your clean hands to combine the mixture thoroughly into a crumbly texture.
Put the fruit into a baking dish (any dish that will fit your fruit snugly is fine, mine is a 71/2 x 91/2 oval) and top with the crumble.
Put the dish onto a baking sheet to catch any drips, and bake for 55-60 minutes, or until the top is golden and the juices are really bubbling. I sometimes top the crumble loosely with a sheet of foil toward the end of baking to prevent it browning too much.
Serve warm, or at room temperature with vanilla ice cream. Store any leftovers on the counter covered with foil.
Notes
*Taste your plums, and if they're very tart you may want to use more sugar.
Nutritional information is provided as a courtesy and is an estimate only. This information comes from online calculators. Although The View from Great Island attempts to provide accurate nutritional information, these figures are only estimates.
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