In a medium bowl, combine the sausage meat, kimchi, scallion and sugar. On a work surface, flatten each biscuit to a 3-inch round. Place 1 tablespoon of the filling in the center of each biscuit, moisten the edges and pinch the seam to seal.
Line a bamboo or metal steamer with a sheet of lightly oiled wax paper. Place the buns on the wax paper, seam side up. Cover and steam for 10 minutes. Serve the steamed buns at once, passing soy sauce on the side.
Kimchi is a spicy Korean condiment made of fermented vegetables, such as cabbage. It is sold in the refrigerated section of Asian markets and some supermarkets.