I ate a mysterious food in Indonesia years ago and can’t find out what it was

About eight years ago while travelling Indonesia, I came across an interesting food from a street vendor in Jakarta. I never saw it before and never found it again, and I couldn’t find out what it was when I had it due to language barriers. Of course I forgot to take a photo. I have since then tried asking people, googling it, and more recently even AI - but no success.

Description:

I literally do not even know if it was plant- or animal based.

It was sort of like a wobbly sheet, about 3-4mm thick, ca. 4-5cm wide and a bit longer (maybe 10-15cm). It was covered in a red spicy sauce, but I believe the original color of the piece was white. It was possible to see the light through it (I remember holding it against the sunlight).

It didn’t have much of its own taste, I just remember the spicy sauce. But the consistency/biting texture was a bit like squid and the mouthfeel of the surface was kind of uneven.

I can’t even say if I liked it, but it was so unique and unlike any other food I ever had.

EDIT 1: I have looked into all 24 answers so far and I so so much appreciate everyone who replied. But somehow the mystery food remains mysterious. Something I want to add is that it was not in the form of a roll or stuffed with anything, it was literally a thick wobbly sheet by itself with sauce.

EDIT 2: 91 replies, I can’t believe it! What an amazing community! I really have to go back to Indonesia soon. I looked up all suggested dishes, and I believe it was either krechek or kikil. Could have also been kwetiao lebar. I’ve seen all three dishes in pictures where they were cut into smaller pieces so I need to consider it might have just been in bigger pieces at the vendor where I got it. Next time in Java I will look for those and see which one it is that I had before. Thank you to you all for your kind replies! And for those here from Indonesia, I had such a great time in your wonderful country when I went, and I still tell people about it to this day. Greetings from across the world!