How to Make It
Make the Yeast Mixture: Combine 1 (1/4-oz.) packet of yeast with 1/2 cup warm water (105°F-115°F) in the bowl of a stand mixer. Add 1 tsp. granulated sugar, stir, and let sit for 5 minutes until foamy. Add 1 cup evaporated milk; 2 large eggs, lightly beaten; 1 tsp. salt; and 1/2 cup sugar.
Form the Dough: In a separate bowl, stir together hot water (about 115°F) with 1/4 cup vegetable shortening; mix until shortening is melted. Add to yeast mixture along with 4 cups bread flour. Using hook attachment, mix until smooth. Gradually add another 2 1/2 cups bread flour, and beat until a sticky dough forms. Transfer to a lightly greased bowl, turning dough to grease entire surface; cover and refrigerate for 4 to 24 hours.
Roll, Cut, and Fry: Prepare Dutch oven by filling with 2 to 3 inches of vegetable oil and heating to 350°F to 360°F. Roll dough to 1/4-inch thickness, cut into 2 1/2-inch squares, and deep fry in prepared oil until puffy and browned, about 2 minutes per side. Drain on paper towels and dust immediately with powdered sugar.