Special equipment: a 1-inch round piping tip and a pastry brush
Preheat the oven to 325 degrees F.
Roll out 1 tube of dough and cut into a 12-inch circle. Fit the circle into the bottom and up the sides of a 9-inch pie dish. Trim the edges with a paring knife if needed. Place the chocolate-covered pretzels in a single layer on the bottom and up the sides of the crust and set aside.
Place the cherries in a large bowl. Whisk the cherry juice and cornstarch in a medium saucepan until smooth. Add the granulated sugar and bring to a boil over medium-high heat. Cook, whisking constantly, until thick and glossy, about 1 minute. Pour the sauce over the cherries and gently fold to combine. Pour into the piecrust.
Cut the remaining piecrust into eight 1-inch thick strips. Use the back of a 1-inch round piping tip to cut out 33 circles from the remaining dough. Mix the baking soda with 1/4 cup water in a small bowl and stir to combine. Brush the dough strips and circles with the baking soda.
Lay 4 evenly-spaced strips across the pie in one direction. Lay the remaining 4 strips of dough perpendicular to the other strips and weave a lattice design. Trim the excess dough at the ends. Place the dough circles on the crust around the rim of the pie to create a border.
Loosely tent the pie with foil and bake until the crust is golden brown, about 1 hour. Remove the foil and bake until the crust is brown and completely cooked, about 5 minutes more. Brush the crust with the butter and sprinkle with the pearl sugar. Let sit at room temperature for 1 hour and up to overnight before serving.
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