Vegetarian Spring Rolls

Name: Vegetarian Spring Rolls
Ingredients: 4 tablespoons coconut oil, divided; 1 small yellow onion, finely diced; 1 garlic clove, minced; 1 teaspoon freshly grated ginger; 1 large carrot, grated, about 1 1/2 cups; 6–8 shiitake mushrooms, diced; 1 cup thinly sliced kale; 1 cup thinly sliced napa cabbage; 1 scallion, diced; 1/2 teaspoon salt; 1/4 cup low sodium soy sauce; 1 tablespoon rice vinegar; 1 teaspoon sesame oil; 12 spring roll wrappers