A traditional dish from Peru that's usually served with French fries, lomo saltado is part of Chifa cooking, a fusion of Chinese and Peruvian cuisines. The yellow chili paste is used extensively in Peruvian cooking.
Most people buy it in a jar but it is easy to make and keeps for a few weeks refrigerated, although if you can't find spicy peppers feel free to omit. I used serrano pepper instead of the traditional aji amarillo chili in the stir-fry.