Preheat the oven to 350 degrees fahrenheit.
Grease a 9"x5" loaf pan or line it with parchment paper.
In a medium-sized bowl, mix together 1.5 cups flour, 1 tsp baking soda, 1 tsp baking powder, and 1/2 tsp salt.
In a small bowl, zest two lemons and set the zest aside to use later.
In a large bowl, mix together the 3/4 cup white sugar, 1/3 cup melted coconut oil, 2 eggs, and 2/3 cup buttermilk. Mix until all of the ingredients are well combined and any solidified coconut oil is mixed in. (See notes below on how to avoid coconut oil chunks.)
After the wet ingredients are mixed, add in half of the lemon zest and mix until just combined.
Add the dry ingredients into the wet ingredients and mix with a wooden spoon until all f the ingredients are combined and no large clumps are present. Some bubbles may form in the mixture - this is normal.
Fold in the poppy seeds and mix until well-combined.
Pour the batter into the prepared loaf pan and bake for 35-40 minutes. The loaf is done when a toothpick inserted into the center of the loaf comes out clean.
While the loaf is cooling, prepare the glaze by combining 1 cup icing sugar and 1 tbsp fresh lemon juice in a small bowl and whisking until the mixture is smooth.
Add 1/4 cups unsweetened shredded coconut to a small, ungreased frying pan and toast over medium-lo heat, stirring occasionally for approximately 10 mintes or until the coconut has a light golden colour.
When the loaf has cooled completely, drizzle the glaze over the top and sprinkle with toasted coconut and additional lemon zest (optional).