The recipe I prefer is a variation of https://thewoksoflife.com/beijing-fried-sauce-noodles-zha-jiang-mian/.

Also known as noodles with fried bean sauce. This is one of my favorite meals and it's a budget friendly dish so I ate this often as a kid.

The original dish is so popular that there are many many variations including Korean and Japanese variations in addition to other variants from different regions of China as well.

The version I like the most is the Beijing style which uses a lot of oil and it's key ingredients are yellow bean paste, sweet bean sauce and pork belly, served with wheat noodles and cucumbers.