Quinoa Soup with Feta Cheese

Name: Quinoa Soup with Feta Cheese
Ingredients: 1 1/4 cups (7 ounces) quinoa; 7 cups water; 1/4 cup unsalted dry-roasted peanuts; 1 tablespoon unsalted butter; 2 tablespoons Annatto Oil; 1 medium onion, finely chopped; 4 ounces feta cheese, preferably French, or queso blanco, crumbled (about 1 cup); 1/2 teaspoon ground cumin; 2 1/2 cups whole milk; 2 medium Yukon Gold potatoes, peeled and cut into 1-inch chunks; Salt; 1 cup chicken stock or canned low-sodium broth; 1/4 cup heavy cream; Freshly ground pepper; Ají , for serving