Tacos are always a good idea on a weeknight. They come together quickly and are a great way to clean out your refrigerator of leftover salsas or cheese nubs and can be an excellent way to incorporate vegetables. Here, mushrooms, poblanos and cherry tomatoes are cooked down into a juicy filling seasoned with onions, garlic and the Puerto Rican spice blend sazón. It's easy enough to make your own sazón spice blend, but you can also find many store-bought options containing some combination of…