Preheat the oven to 425 degrees F.
In a medium bowl, whisk together the flour and salt. In another bowl, whisk together the milk, butter, and eggs. Make a well in the flour, pour in the milk mixture, and whisk to make a smooth batter. Set batter aside for 10 minutes.
Heat a non-stick or well-seasoned 6-cup popover pan in the oven for 5 minutes. Carefully remove the pan from the oven and brush the inside of the cups with the shortening. Ladle the batter into the cups and bake for 20 minutes, without opening the oven. (Do not open the oven during baking.)
Lower the heat to 350 degrees F. and continue to bake the popovers for 20 minutes, at this point they will be golden brown. Right after removing the popovers from the oven, poke each one with a paring knife to release steam. Turn popovers from the pan and serve immediately with butter and jam.
This recipe can also be made in a 12-cup mini-popover pan; baking times and temperatures will remain the same.
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