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1
Preheat oven to 400 F.
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2
In a large bowl, combine chilled flour, salt and sugar.
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3
Add the butter and cut it into the flour mixture using a pastry blender.
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4
Blend until the largest pieces are the size of small peas.
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5
Add in the water and lemon juice.
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6
Combine until the dough starts to come together.
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7
Pat the dough gently into a ball.
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8
Cover with plastic wrap and chill for 1-2 hours.
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9
Heat olive oil in a large skillet over medium-high heat.
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10
Add in the onions.
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11
Let the onions cook, stirring occasionally, until caramelized, approximately 45 minutes.
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12
Once dough is chilled, put it onto a parchment paper lined baking sheet and use a rolling pin to roll it into a 12 inch circle.
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13
Add the goat cheese, caramelized onions and rosemary into the center of the circle of dough.
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14
Leave a 2 inch diameter around the edge of the dough.
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15
Fold the edges of the dough in and over the filling (the center filling will still be showing).
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16
Combine the egg and water in a small bowl to create an egg wash.
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17
Spread the egg wash on the exposed pastry.
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18
Cook in the preheated oven for 35-40 minutes until golden brown.
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19
Let the galette cool for 5-10 minutes before serving.
