Ingredients
For the Onion Jam:
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1 1/2 teaspoons fruit pectin
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1 1/2 teaspoons warm water
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1 Tablespoon unsalted butter
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6 cups thinly sliced yellow onions (about 3 large onions)
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1/2 cup white wine vinegar
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1 cup white sugar
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2 teaspoons chopped fresh thyme
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1 bay leaf
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2 teaspoons kosher salt
For the Crostini:
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1 Honeycrisp or Granny Smith apple
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4 ounces ripe Brie cheese
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1 ciabatta bread or baguette, sliced
Instructions
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In a small bowl, mix the fruit pectin with the warm water and set aside to bloom.
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Melt the butter in a large saucepan over medium heat. Add the sliced onions and cook until they are golden brown, soft, and translucent, about 15–20 minutes.
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Add the vinegar, sugar, thyme, bay leaf, and salt. Reduce the heat to low and stir in the bloomed pectin.
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Simmer for another 15–20 minutes, stirring occasionally, until the mixture thickens and coats the back of a spoon.
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Transfer the onion jam to a small mason jar and let cool.
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Toast the bread slices on both sides until golden brown. You can do this on a BBQ, in a toaster oven, or under the broiler in the oven.
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Thinly slice the Brie and the apple.
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To assemble: lay slices of Brie on the toasted bread, top with apple slices, and spoon some onion jam over the top.
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Serve immediately and watch them disappear.