Combine the miso, soy, sugar, vinegar, ginger, garlic and oil in a small bowl.
Place a steamer basket or bamboo steamer in a large saucepan. Pour water in the pan, underneath and up to the steamer.
Place then ribs on plate. Brush them with one-third of the miso mixture then put them in the steamer basket. Cover the pan and bring to a simmer over medium heat. Steam for 30 minutes or until the ribs are tender. Keep adding water to the pan every 10 minutes (not touching the meat).
Remove the ribs to a plate. (When cooled the can be placed in the fridge or grilled immediately.)
When you’re ready to grill, preheat BBQ or griddle pan. Brush the remaining glaze over the ribs. Grill them for 3-5 minutes each side until sticky and golden.
Serve warm or at room temperature.