Preheat your oven to 350°F. Spray your loaf pan with non-stick cooking spray and set aside.
Using a hand mixer or stand mixer, whisk together in a large bowl the sour cream, eggs, sugar, coconut oil, lemon zest and lemon extract. Set aside.
In a separate medium-sized bowl, mix together the cake flour, baking powder and salt. Once you have done this, slowly mix the dry ingredients into the wet ingredients. Add a little at a time and mix together with the hand mixer until everything is just combined. Do not over mix. The batter may be slightly lumpy.
Pour your lemon loaf cake batter into the greased loaf pan. Bake for 50 minutes, or until an inserted toothpick comes out clean.
While the lemon loaf cake is baking, you will want to make your syrup. Mix the sugar, water and fresh squeezed lemon juice together in a glass microwaveable safe measuring cup. Microwave on high for 2-3 minutes, stopping it to stir about every 30 seconds. It will boil a bit. You will know the syrup is ready when the sugar is dissolved, and the syrup is a cohesive mixture.
Once the cake is done and has cooled for 10 minutes, poke the cake in several places with a wooden skewer. Do not poke all the way through to the bottom.
Leaving the lemon loaf cake in the pan, pour the lemon syrup evenly over the loaf. It will soak into the loaf cake via the small holes that you just made. Let it sit and cool completely in the pan.
Once the cake has completely cooled, slice it up and serve. Enjoy!