Soup.
When it comes to whole taste of Ramen, I can't emphasize enough how important soup is.
What is role of soup of Ramen?
Main function of Ramen soup is to give the whole flavor. It is dominant and decisive、trunk of Ramen. I would say... around 70-80 % of good taste of Ramen is dependent on its soup. (some types of Ramen is served without soup, though)
Soup includes
Umami from several ingredients, and like an artwork there is no only answer. If you feel the soup is tasty it surely has Umami. I don't go deep into its mechanism, but will gradually explain in posts.
Usually served with sauce which adds salinity and other flavors, not directly itself.
How to make basic Ramen soup?
It greatly depends on what you want for the soup. Some like chicken-carcass based soup, others like pork-born based one, and also, though not majority, vegetable-based.
Although every Ramen bar, seemingly, has created combination of ingredients for soup and it is often secret, there is more or less basic recipe for this era.
Combination of chicken-bone, porn-bone, and veges
Availability of bones may vary depending on your country or region, I postulate those below are not very hard to obtain. Just chicken carcass is ok as well, however pork bones may render the soup more powerful flavor.
Strictly speaking, it is not bone of each animal itself that makes soup tasteful, but meat around it and marrow inside. Extracting the Umami is the core.
However merely animal bones based soup stinks. So, veges are often used to reduce the smell of "beast". Especially if you are pork bone fan, better to use veges. (Some Ramen bar don't use veges as they think it is original flavor of animals and it should not be killed)
Recipe: basic Ramen soup
(for 4 people)
Chicken carcass 2 (around 1kg)
Pork spine (or pork leg bone) 500g-1kg
Leek (green part) 50g-100g
Ginger 10g
Garlic 10g
Onion 1-2
preparation
1 Put chickens into boiling water. If its surface become white after 1-2 minutes, it's okay. Remove organs inside body.Rinse them a bit with water.
2 Put pork bones into boiling water. Spine for 4-5 minutes, legs 10-15 minutes. Rinse them a bit with water. If possible, legs should be broken, with hammer or sth, as marrows will spread quickly and effectively.
Boiling the ingredients
3 Put chicken and pork into cold water (absolutely cold water, not hot!!) and start boiling stockpot.
4 After it got boiling, scums will appear on the surface. It will disappear after a while but better to remove them. Continue to boil.
5 As scums is gone, put veges into it. At this point, if you want creamy and milky soup, continue to boil it with high fire level. If you would like more transparent soup in comparison, set fire level low. If fire level is high, keep an eye on the water level, as it can evaporate faster. For milky soup, using a tool to break bones (wooden bar or sth substitution) may be quicker to finish.
6 2 or 3 hours of boiling is ok for this amount of soup. Check it and if you feel flavor of them it is done.
It is just one suggestion of basic of basic. You can arrange according to your favorite taste and ingredients.