Here's a recipe you can start with. . . .
1 bunch Cilantro
1 bunch recao
1 head of garlic
3 large onions
1 lb. ajíes dulces
2 cubanese peppers or 2 large bell peppers
½ cup olives with pimientos
1 sm jar roasted red peppers
1 tbsp. cappers
2 tbsp. crushed oregano
1 tbsp. salt
1 tsp. black pepper
1 tsp. cheyenne pepper (optional)
1 cup EVOO (extra virgin olive oil)
Prepare the ingredients - peel, wash, seed and coarsely chop, what needs to be and just dump it all in the blender or food processor, in batches. Dump in a bowl and mix well. Freeze in ice-cube trays, then dump in a double freezer bag. That's all!
* Note that thyme, rosemary, celery and tomato or tomato sauce are not a traditional ingredient in sofrito. Tomatoes might be called for in a recipe but are a separate ingredient. I always have canned Italian Style tomatoes to use in rice and beans.
You might not find all the ingredients, just use what you have, onions, garlic, and bell pepper are a must. Even though this recipe includes olives and capers I always add whole olives and capers to the dish.