The most delicious sambal is from Surinam in my opinion. Sambal is very common in lots of food cultures, Asian, Middle Eastern. In The Netherlands, we have lots of Indonesian food (Indonesia was a Dutch colony once) and lots of Surinam food, so sambal is quite common here too. You can eat it with so much more than just asian food though.
I noticed! You can also easily make it yourself. You just need some red peppers, a madame jeannet pepper, garlic, onion, ketjap manis (do you guys have that?), sugar, oil.