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1
To make the crust, preheat the oven to 375u00b0F Coat a 9x13-inch baking pan with cooking spray.
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2
Using a mixer fitted with a paddle attachment, beat the butter and sugar in a large bowl about 3 minutes, until creamy.
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3
Add the flour, salt and zest. Beat just until incorporated.
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4
Press the dough evenly into prepared pan. Bake for 12-15 minutes until golden brown.
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5
Let cool about 10 minutes. Spread the jam evenly over the cooled crust.
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6
Leave oven at 350u00b0F.
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7
Whisk the egg yolks for the filling with the eggs, sugar, lemon juice and champagne in a large bowl set over a pan of simmering water. (make sure the water does not touch the bottom of the bowl).
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8
Cook about 15 minutes, whisking occasionally, until the mixture thickens. Cut the cold butter into bite sized pieces.
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9
Whisk the butter, one piece at a time into the lemon mixture. Cook about 10 minutes longer, whisking occasionally. The mixture will be thick and puddinglike.
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10
Pour the fillng over the prepared crust and bake for 10-12 minutes. Refrigerate the bars at least 2 hours over overnight. (If you are in a hurry they will get sufficiently cold after 1 hour in the freezer).
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11
Slice the strawberries thinly and arrange them in a single layer over the top of the lemon filling. Sprinkle the sugar evenly over top of the berries.
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12
Use a kitchen torch to melt the sugar until it is brown and crackly, or put the bars under a hot broiler for about 1 minute, until the sugar melts and browns. Watch carefully.
