Preheat the oven to 170 degrees Celsius - 338 F.
Grease well a 22 cm x 10 cm (8-Inches X 4-Inches) English cake pan; If using a silicone mold - only light greasing is required.
Sift the flour into a large bowl, add the rest of the dry ingredients and mix with a whisk; Set aside.
Mix the boiling water with the coffee in a glass and pour it into another large bowl.
Add oil, applesauce, date syrup, and rum-flavored extract.
Mix the milk and vinegar in a small bowl and add it to the bowl with the wet ingredients.
Add the dry ingredients to the wet ingredients bowl, add it gradually, and mix just until combined. Avoid overmixing.
Transfer to a pan, place in the center of the oven, and bake for 45-55 minutes or until a wooden skewer comes out clean and dry.
Remove from the oven and cool on a wire rack while still in the pan.