Zhug is a really spicy, strongly flavored Yemenite hot sauce. My husband loves it with pretty much everything, but especially roasted eggplant and challah. (I don’t remember where I got this recipe–years ago–but the measurements are approximate.)
Zhug
1 lb serrano peppers
5 whole heads garlic
1 C or 1 bunch cilantro
2t crushed red pepper
1/2 t cumin
pinch of salt, or to taste
Check greens, peel garlic, and cut tops off peppers. Process peppers, garlic, and cilantro until texture you like, we do to semi smooth paste. Add in remaining ingredients, stir. Stores well in the refrigerator for a few weeks.
Mouth and eye-wateringly good! 
