It's easy to recreate the flavors of McDonald's annual St. Patrick's Day shake using only four ingredients. The two that make this holiday shake special are the mint extract and green food coloring. Make sure your extract says "mint" and not "peppermint". And if you don't care to have shakes that are green like the real ones, you can forego the food coloring.
Source: Top Secret Recipes: Sodas, Smoothies, Spirits & Shakes by Todd Wilbur.
Update 3/14/17: For a thicker, mintier McDonald's Shamrock Shake recipe add only 1 cup of milk. If your blender can't mix it up, add 1/4 cup of milk at a time until it blends. Also, the new Shamrock Shakes have whipped cream and a cherry on top.
This recipe is available in
- 2 cups vanilla ice cream
- 1 1/4 cups low-fat milk
- 1/4 teaspoon mint extract (not peppermint)
- 8 drops green food coloring