Braised Kale

Ingredients

• 1 medium onion
• 2 large cloves garlic
• 2 tbsp grapeseed or coconut oil
• 2 tbsp oil or butter* (optional)
• 2 lb kale, preferably flat leaf (can also use Swiss chard or collard greens)
• 2 cups flavorful stock
• 1 tbsp sherry or red wine vinegar (optional)
• sea salt, to taste
• freshly ground black pepper. to taste