If you've tried everything from caffeine shampoos to minoxidil to lunar calendars and are still waiting for your hair to start growing as fast as weeds in the garden, we have one of those solutions that will make you roll your eyes at first – and then roll up your sleeves with joy. We're talking about a very special homemade mixture: strong black coffee + freshly grated onion + coconut oil. Yes, we know – it sounds like a salad recipe, not a beauty treatment. But perhaps this culinary combination is the secret to lush, strong and shiny hair.