Slice the fresh chili peppers thinly. Place into a mortar and pestle along with 2 teaspoons salt. Grind and mix thoroughly with the pestle. You don’t need to form a paste, just break down the peppers slightly.
While it's a good paprika substitute when you want mild spiciness and heat when using a 1:1 substitution ratio, you can increase the amount added for more heat. Specifically, you can double the amount of what's listed in your recipe for hot paprika.