Preheat oven to 350 degrees (F). Generously grease a doughnut pan; set aside.
In a small bowl whisk together flour, baking powder and salt; set aside.
In a large bowl combine the granulated sugar and lime zest; mix together with your fingers until zest is evenly distributed in the sugar. Add in the melted coconut oil and, using a whisk, mix until combined. Beat in the egg, then stir in coconut milk.
Add in the dry ingredients and gently fold the mixture together using a rubber spatula, stirring only until mixture is evenly combined.
Divide the thick batter evenly among the molds of your prepared pan, filling each mold up 2/3 of the way. Bake for 10-11 minutes, or until firm and lightly golden on the tops.
Remove pan from oven and allow doughnuts to cool for at least 10 minutes in the tray before transferring to a cooling wrack to cool completely.
Once cool, dip each doughnut in glaze and serve! The glaze does take a few minutes to set, so you may want to wait about 5 minutes after glazing to dig in... but it's hard!
For the Key Lime Glaze:
In a wide, shallow dish combine juice and sugar, and whisk to combine. If the glaze appears too thick, add a little more lime juice until desired consistency is achieved; if glaze appears too thin, add a little more confectioners' sugar until desired consistency is achieved. Carefully dip cooled doughnuts in the glaze, and let rest for 5 minutes - if you can wait - before serving. If you'd like your donuts to look exactly like mine do in the photos, top each glazed donut toasted coconut and extra lime zest.
Notes
Donuts are best eaten the day they are made.
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