The word "rajas" just means "strips" but in Mexican cooking it refers to strips of chiles. The chiles are roasted, peeled, and cut into strips. After that the recipe can vary but normally they are sautéed with onions, herbs and seasonings. The cooked mixture is used as a condiment with meats or as a vegetable side dish.
2 tablespoons olive oil or butter
4-6 roasted poblano chiles, peeled and deveined and
sliced in 1/4 inch strips
1 large white onion, diced
1 tablespoon chicken bouillon
1-1 1/2 cup sliced mushrooms
1 cup Mexican or sour cream
Sauté the chilies with the onions and mushrooms until soft, about 10 minutes.
Add chicken base and stir.
Add the cream, let simmer 10 to 15 minutes.
Serve warm with corn tortillas.
Can be prepared ahead and reheated in the microwave.