Preheat oven to 450-degrees Fahrenheit and line baking sheet with parchment paper.
With a fork or a pastry-cutter, mix the shortening flour until you have a coarse mixture like wet sand. Now add the curdled soymilk-vinegar mixture and mix quickly until the dough comes together.
Make a ball of the dough, cover with plastic wrap, and refrigerate for 15-30 minutes.
Now take the dough and roll it into about 1/2-inch thickness. Use a round cookie cutter about 1 1/2 to 2 inches in diameter to cut the biscuits.
Sprinkle each biscuit with 1tsp crushed sunflower and pumpkin seeds and slightly press onto dough.
Place the biscuits on an ungreased cookie sheet and bake them for 12 minutes.