Preheat the oven to 350°F. Grease an 8-inch square or round cake pan with oil and set it aside.
Add 1 tablespoon of white vinegar to the milk, stir well, and set it aside.
Add the coffee powder to 1 tablespoon of hot water, mix until the powder is dissolved, and set it aside.
Sift flour, baking powder, baking soda, and salt in a medium bowl, and whisk well. Add ground almonds to this and whisk well until everything is well combined.
Mix oil, brown sugar, and granulated sugar in a large mixing bowl until combined.
Add dissolved coffee, vanilla, almond extract, and brown food color. Mix well until everything is combined.
Now, add the dry ingredients and buttermilk alternatively into the wet ingredients in two parts. Mix until everything is just combined; do not overmix.
Pour the batter into the prepared pan and sprinkle chopped almonds evenly on top of the batter.
Bake the cake in the oven for 25-30 minutes or until a cake skewer inserted in the center comes out clean.
Remove the cake from the oven and place the pan on a cooling rack. Allow the cake to cool down completely in the pan before removing it.