Preheat the oven to 400 F (200°C). Line a cupcake tray with liners.
In a bowl combine the granulated sugar and lemon zest. Use your hands or a fork to infuse the lemon zest into the sugar.
1/2 cup granulated sugar, 1/2 tbsp lemon zest
To the same bowl, add butter, oil, vanilla and an egg. Whisk for 1 to 2 minutes or until the mixture is pale in colour.
3 tablespoon canola oil, 1 tablespoon unsalted butter,, 1 large egg,, 1/2 teaspoon vanilla extract
In a separate bowl combine all-purpose flour, baking powder and salt. Stir to combine.
1 1/4 cup all-purpose flour (150 grams), 1 1/2 teaspoon baking powder, 1/4 teaspoon sea salt
Place the dried blueberries in a bowl, sprinkle a tablespoon of flour onto the blueberries and gently fold.
1 cup blueberries (fresh or frozen), 1 tbsp all-purpose flour
Combine the wet and dry ingredients together and fold the batter for a few seconds. Pour the buttermilk into the batter slowly while continuing to stir. Once the batter is fully combined, add in the blueberries and gently fold it in (the batter should be really dense and thick). Cover the bowl with a kitchen cloth and allow the batter to rest for 15 minutes.
1/3 cup buttermilk,
Scoop 1/3 cup of batter into each muffin liner (for larger muffin domes, fill the entire liner with the muffin batter). Top with extra blueberries and sprinkle with turbinado sugar. Bake for 15 to 20 minutes and insert a toothpick to check if the muffins are done. Allow the muffins to cool for a few minutes before transferring to a wired rack.
1 tablespoon tubrinado sugar,