Inguday Tibs (Spicy Ethiopian Mushrooms)

Name: Inguday Tibs (Spicy Ethiopian Mushrooms)
Ingredients: 4 large portobello mushrooms, cut into ¾-inch cubes; 2 cups green beans, cut into 2-inch pieces; 2 cups chopped onions; 2 tablespoons lemon juice; 2 pitted dates, finely chopped; 1 tablespoon Berbere Spice Blend (see tip, recipe intro); 1 tablespoon sweet paprika; 1 teaspoon mustard powder; ¼ teaspoon ground cardamom; 1 tablespoon brown rice flour; 1 tablespoon red wine vinegar; Sea salt, to taste; 1 tablespoon chopped fresh cilantro