I got these pork bones at the supermarket (they were being sold for about 15-30 yen per 100 g in my neighborhood). I think about 5 bones come out to 3 kg.

Wash off the blood under running water. Place the bones in a large pot of cold water. Bring the pot to a boil (at this point, the bones will be giving off a very strong odor, but don't worry).

A lot of scum will come to the surface. Scoop it out diligently (I know this part is a bit off-putting, but stick with it. It'll turn out okay).

Strain in a colander and remove the remaining blood from the bones with a scrubbing brush.

Use a saw to make a slice in middle of the bones, and a hammer to break them in half. (It's easier if you make an incision before snapping them).

Look at all the bone marrow inside the bones. We'll be melting it out by simmering these bones over a long period of time.

Now start to add the other ingredients for the soup. Diligently remove the scum that rises to the top. Keep the heat at medium and maintain a gentle boil.

Once the scum has been removed, simmer the broth for another 6 hours. Add more water if it boils off.

Next we'll be preparing the noodles. Measure out the ingredients and mix the flour and powdered kansui together. Add the water. It'll feel like a very small amount of water, but don't worry.

Mix the ingredients until the dough starts to clump together in the bowl.

The dough is a pretty tough one, so be careful not to hurt your wrists. Try mixing it with the weight of your body.

Move the dough to a working surface and knead. Don't worry too much about cracks or inconsistencies yet. Just knead for about 10 minutes.

Round up into a ball, wrap with plastic cling wrap, and let sit in the refrigerator (for at least 30 minutes. Then check if the dough has settled).

Prepare the char siu in the meantime. Brown the meat in a frying pan, and simmer for 2 hours in a pot with the combined seasoning ingredients. Let cool in the pot.

Once the dough has become moist, roll out to a thickness of 5 mm. Use a pasta machine to even it out to your desired thickness.

You can manage with just a little bit of dusting flour (katakuriko or bread flour) since the dough isn't that sticky.

About two hours after simmering the broth, it'll start to get white and cloudy. I wouldn't taste testing it just yet, since it'll still be somewhat smelly.

Here's what the broth should look like after 6 hours of simmering. The marrow has melted out of the bones, which have emptied out. The soup now looks quite rich and smells like it should (just like what you get a ramen joint).

The char siu should have become a caramel brown. Take care not to break it apart when you're slicing the meat, since it'll be quite soft at this point.

Enjoy the leftovers with a cold beer!

Now that you have everything prepared, get ready to make your ramen. Boil each serving of noodles separately and adjust the times carefully by watching over them. If you'd like your noodles rippled, squeeze the noodles once and fluff them out again before boiling.

The boiling time for the noodles should be about 1:30-2 minutes, but this is something you can change according to your preferences. Once you add your noodles to the soup and garnish with your desired toppings, your rich and creamy tonkotsu ramen is complete.