Amba, a pickled mango sauce, is one of my favorite condiments. It's tangy, funky, and deep. It can be tricky to find in stores, but it's relatively easy to make at home if you plan ahead. It can be good to make a large batch and freeze in smaller containers.
Ferment the mangoes for a good week
Ignore the drying step, I needed to add plenty of water back in for the right consistency
You can use 1 tsp chili powder instead of fresh peppers if needed
Pre-grind the cumin seeds for a smooth final texture
This recipe is very cumin-heavy, which agrees with me, but feel free to adjust the spice ratios to your preference