– Zest of 2 large lemons or 3 small – 165g or ¾ cup granulated sugar – 1 large egg plus 1 yolk – 100g or ½ cup canola grapeseed or avocado oil – 2 teaspoons pure vanilla extract – ½ tsp lemon extract – ½ tsp fine sea salt – 250g or 2 cups all purpose flour – 1 ½ teaspoons baking powder – ¼ tsp baking soda – 160g or ⅔ cup buttermilk, kefir strawberry kefir or strawberry yogurt thinned out with water – 1 cup of fresh berries, roughly diced strawberries, blueberries, raspberries or blackberrie – Organic granulated sugar or turbinado sugar for topping or streusel from below Lemony Muffin Streusel – 65 g or ½ cup all purpose flour – 1 tablespoon powdered sugar – 2 tablespoons granulated sugar – Pinch fine sea salt – Zest of 1 lemon – 3 tablespoons butter