Mix the butter soft possible with sugar. the salt and the egg. Sift over the flour and knead everything until dough is broken. Let stand covered mass 2 hours in the refrigerator.
Spread two-thirds of the mass form that is thin and lined with her Pan under of 24 cm in diameter. leaving something beyond the edge. Heat oven to 200 degrees. Melt the butter in a saucepan, Add the sugar and unceasingly remove leave that it acaramele to take a toasted clear color.
Add the walnuts and cream and bring a boil, allow to cool. Spread the rest of the dough in the form of appropriate size circular blade. Spread the filling onto the bottom of the cake and place on top the layer of dough.
Brush the edge with beaten egg yolk, fold over the edge that protrudes from the bottom and tighten it. Rub the surface with the rest of the yolk and prick several times with a fork.
Bake the cake 30-40 minutes to half-height. Allow to cool on a wire rack.
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