With St Patrick's Day right around the corner, I figured, it was the perfect time to share how to make one of my favorite milkshakes, a Homemade Shamrock Shake. McDonald's signature St. Patty's Day shake has long been a favourite of mine. Have you tried it? It only comes around for a limited time, right before St. Patrick's Day, but this year, let's make it at home. It's super easy and much cheaper!