When I was young, I used to help my mother on Sundays. We would go to a market, almost like a farmer's market, and we would always end up at the end of the market where the food stands were. My favourite food stand was the tostada one. Every time I would have one of these I would always make a mess of myself. All the sauce would be spilling down my shirt and then my mother would get upset. But it was so much fun to eat!
Just remember with this recipe, Serranos are very, very spicy. I love the heat in my sauce!