Stir the vinegar into the milk, and let stand for a few minutes until thick.
In a medium bowl, cream together the shortening and sugar until smooth. Beat in the egg and vanilla until well blended. Sift together the flour, baking soda, and salt; stir into the sugar mixture alternating with the vinegar and milk. Roll dough out on a floured surface to 1/3 inch thickness. Cut into doughnuts using a donut cutter. Let stand for about 10 minutes.
Heat the oil in a large deep skillet to 375 degrees F (190 degrees C). Fry doughnuts in the hot oil until golden, turning over once. Drain on paper towels. Dust with confectioners’ sugar while they are still warm, and serve immediately.
We have determined the nutritional value of oil for frying based on a retention value of 10% after cooking. The exact amount may vary depending on cook time and temperature, ingredient density, and the specific type of oil used.
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