First, scoop the seeds and soft pulp out of 450 g kabocha squash and discard.
Cut the kabocha into equal size chunks, leaving the skin on.
Place the kabocha pieces in a large pot with the skin side facing up. Make sure the kabocha pieces make only one layer in the pan so that the pieces aren't overlapping or sitting on top of one another.
Add 300 ml dashi stock to the pot, place on the stove and bring to a boil over a medium heat.
Once the dashi is boiling, add ½ tbsp sugar, 2 tbsp mirin, 2 tbsp soy sauce and 2 tbsp sake Continue to boil for 2 minutes and then lower the heat to a simmer.
Place a drop lid in the pot touching the surface of the kabocha (you can use a sheet of foil or baking paper if you don't own a drop lid) and simmer for 10 mins.
Pierce with a fork to check the softness. If it's not fully done, continue to simmer with the drop lid and check every 2-3 minutes.
Enjoy!