In a large bowl, combine the flour, granulated sugar, chia seeds, lemon zest, baking powder, baking soda, and salt.
In a small bowl, slowly heat the Armour Premium All-Natural Lard in a microwave in 5 second increments. Brush the bottom, sides, and edges of each muffin tin with some of the melted lard. Set the lard aside and let cool.
In a medium sized bowl whisk the sour cream, egg, 1 tablespoon of lemon juice, 1 1/2 teaspoons of vanilla and melted lard until creamy.
Fold the wet mixture into the dry mixture and stir until lightly moistened. Do not over stir. If the batter is too dry, add 3 - 4 tablespoons of milk.
Evenly spoon the muffin batter into the prepared muffin tins. Bake for 18 minutes until golden brown and a toothpick inserted in the middle comes clean.
Cool for 1 minute in the pan on a wire cooling rack. Carefully remove the muffins and continue cooling on the rack.
Stir together the remaining lemon juice, vanilla paste, and powdered sugar until smooth. Drizzle the glaze over the muffins.