To a small mixing bowl, add the sugar and lemon zest. Use your fingers to rub the zest into the sugar until the mixture resembles wet sand.
Add in the melted butter, oil, egg, almond extract, and buttermilk. Whisk the mixture until it is cohesive and well combined.
Add in the flour, baking powder, baking soda, salt, and poppy seeds. Gently stir the batter together just until no flour streaks remain.
Optional: Cover the batter and let it rest at room temperature for 1 hour. This will help get a higher-rising muffin.
Preheat the oven to 425°F / 220°C. Line a muffin tin with 6 parchment liners, alternating between each cup.
Evenly distribute the lemon poppy seed batter between the six parchment liners.
Bake the muffins at 425°F for 5 minutes. Without opening the oven door, reduce the temperature to 350°F / 175°C. Bake for an additional 10 minutes, or until a toothpick inserted into the center of the muffins comes out clean.
Lemon Simple Syrup
In a small bowl, whisk together the lemon juice and sugar. Microwave the mixture in 30 second intervals, stirring after each, until the sugar has dissolved.
Once the muffins come out of the oven, brush them with a generous amount of simple syrup.