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1
Combine the flour, salt, oatmeal, flour, butter, and cheese in the bowl of a food processor and process until the mixture resembles coarse bread crumbs.
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2
Transfer to a bowl, add the water, and mix until a soft dough forms.
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3
Form the dough into a ball and let it rest for 30 minutes.
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4
Preheat oven to 325 degrees.
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5
Roll out the pastry on a lightly floured surface.
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6
Cut pastry into six 4-inch rounds, line six individual tarts pans with the pastry, prick the bottoms, and refrigerate for 30 minutes.
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7
Bake until golden brown, 15 to 20 minutes.
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8
Meanwhile, in a heavy saucepan over medium heat, combine onions and vinegar.
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9
Cover with wax paper and lid.
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10
Cook gently for 30 minutes.
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11
Remove paper and lid, add the honey, and cook until the liquid has nearly evaporated and the onions are caramelized.
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12
Season to taste with salt and pepper.
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13
In a small bowl, mash the blue cheese with a fork and blend with the yogurt.
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14
To serve, remove pastry from tart pans and place in the center of a warmed serving plate.
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15
With a slotted spoon, fill each with enough red onion mixture to cover base.
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16
Place a spoonful of blue cheese mixture on top.
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17
Drizzle with reduced balsamic vinegar and garnish with a sprig of fresh chervil.
