Sift flour and salt. Mix milk, water, and eggs; beat well. Add egg mixture to dry mixture and beat until smooth. Let stand for 30 minutes.
Heat oven to 450 degrees. Add 1 teaspoon fat to each section of a muffin tin (bacon grease works well). Heat muffin tin in the oven until fat is very hot. Pour in batter to fill each cup 3/4 of the way full (batter will sizzle) and bake 20 minutes until crisp and golden. Do not open oven during baking or they might collapse.
Serve with thick gravy or sprinkled with powdered sugar. Makes 10 to 12 puddings.