A question about a recipe: Chicken Meatball Tikka Masala

Hmm... When Cecilia tested the recipe she added the serrano with the shallots, garlic, and ginger with great success.

Sorry, I didn't even enter the question!

My question is- What do I do with the halved serrano in the sauce part of the recipe? I simply halved it and added it to the simmering sauce but I did not see exactly what I was supposed to do with it.