Kale Stir Fry

So I haven't actually tried this one... but doesn't it sound good? And shouldn't eating kale be a daily thing?

Ingredients
1 tablespoon olive oil 
1 clove garlic, minced 
1 small onion, halved and sliced thin 
1 (7 ounce) can water chestnuts, drained and thinly sliced 
3 shiitake mushrooms, sliced (if using dried, soak, discard the stems and slice) 
1 pound kale, washed and cut into large pieces 
1 teaspoon mirin (or seasoned brown rice vinegar) 
1 teaspoon tamari (or high quality soy sauce) 
Freshly ground black pepper, to taste 

Ingredient Options: Combine several types of greens. Add 1 tablespoon of brown rice syrup along with the tamari. Use chard and add a cup of drained, chopped tomatoes after adding the greens. Top greens with chopped, roasted walnuts.
Method
Heat oil in a large skillet over medium high heat. Add garlic and onions and sauté until onions are translucent. Be careful not to brown garlic or it will give a bitter taste. 

Add water chestnuts and shiitake mushrooms. Sauté for 3 minutes. Add kale and sauté for 1 minute. Add mirin, tamari and pepper and continue cooking until kale is just tender.