Preheat oven to 340 F or boil water to prepare the steamer. Also grease a Pyrex 7 cup round container or two 4 cup round containers with some oil (spray oil works fine, too).
In a clean bowl, mix glutinous rice flour (mochiko flour) with sugar. Set aside.
Heat almond milk in a microwave safe bowl or glass measuring cup until hot, about 2 minutes. (This is an optional step to make the mochi chewier. Read notes**)
Stir in the instant coffee granules into the milk until completely dissolved.
Pour the coffee almond milk into the flour-sugar mixture and use a whisk to mix well.
Stir the coconut oil into the batter
Add chestnuts and dried fruit to the batter
Pour batter into the prepared pan or container, and bake in oven 340F for 40 minutes for TWO-4 cup cakes, or about 60 minutes for 7 cup cakes, or until the middle is set and the edges are crispy.
For softer traditional texture, steam on medium heat for 45-60 mins for large cakes, 30-40 minutes for smaller cakes, or until the center of the mochi cake is set.
Let cool completely before serving, or cool the cakes in the freezer for 2-3 hours which helps to get clean slices of cakes.
Fry the sliced mochi cakes in oil if desired. Enjoy!