For the Dough
Put the flour, confectioners' sugar and salt in the workbowl of a food processor and pulse a couple of times to combine. Scatter the pieces of butter over the dry ingredients and pulse until the butter is cut in coarsely - you'll have pieces the size of oatmeal flakes and pea-size pieces and that's just fine. Stir the egg, just to break it up, and add it a little at a time, pulsing after each addition. When the egg is in, process in long pulses - about 10 seconds each - until the dough, which will look granular soon after the egg is added, forms clumps and curds. Just before your reaches this clumpy stage, the sound of the machine working the dough will change - heads up. Turn the dough out onto a work surface.

Very lightly and sparingly - make that very, very lightly and sparingly - knead the dough just to incorporate any dry ingredients that might have escaped mixing.

If you want to press the dough into a tart pan, now is the time to do it.

If you want to chill the dough and roll it out later (doable, but fussier than pressing), gather the dough into a ball (you might have to use a little more pressure than you used to mix in dry bits, because you do want the ball to be just this side of cohesive), flatten it into a disk, wrap it well and chill it for at least 2 hours or for up to 1 day.

Butter the tart pan and press the dough evenly along the bottom and up the sides of the pan. Don't be stingy - you want a crust with a little heft because you want to be able to both taste and feel it. Also, don't be too heavy-handed - you want to press the crust in so that the pieces cling to one another and knit together when baked, but you don't want to press so hard that the crust loses its crumbly shortbreadish texture. Freeze the crust for at least 30 minutes, preferably longer, before baking.

Center a rack in the oven and preheat the oven to 375 degrees F. Butter the shiny side of a piece of aluminum foil and fit the foil tightly against the crust. Bake the crust 25 minutes, then carefully remove the foil. If the crust has puffed, press it down gently with the back of a spoon. Bake for another 3 to 5 minutes, then transfer the crust to a cooling rack; keep it in its pan.

For the Filling and Assembly
Measure the cream and butter into a saucepan and heat it over low heat. When the butter has melted completely, remove from heat.

To make the caramel, spread the sugar evenly in a perfectly dry, deep 10-inch skillet and place it over medium-low heat.

The sugar should turn straw-colored, then gold and then a nutty-brown caramel after about 10 minutes. If the sugar cooks unevenly, gently tilt or swirl the pan to evenly distribute the sugar. Remove from heat and slowly whisk the cream and butter into the sugar, which can splatter as the cream is added. If the caramel seizes, return it to the heat and continue to stir until it is smooth and creamy. Strain the caramel into a bowl and cool it for 30 minutes.

Stir the frozen cranberries and the almonds into the caramel and mix until all the fruit and nuts are coated. Spoon the filling into the partially baked tart dough mounding toward the center.

Bake for 25 to 30 minutes, until the juices and the caramel are bubbling slowly around the edges. Remove from the oven and let stand for 1 hour, then gently lift the tart ring off the pastry.

Carefully transfer the tart to a serving platter. Serve warm or at room temperature.