Preheat the oven to 180 degrees.
Heat the milk on medium flame.Add the butter and jaggery to it.Let it come to a bubble and switch the heat off.
Let the milk mixture cool.
Meanwhile,Mix in the baking powder, baking soda and the whole wheat flour in a bowl separetly.
Break two eggs in a bowl and whisk.Trickle in the whisked eggs to the hot(but not boiling) milk mixture slowly and fold in.If there are any jaggery lumps, make sure to press them with he back of your spoon and mix well.
Once the eggs have been folded, tip over the dry ingredients and fold.
Next,Add 2 teaspoon vanilla essence and the Lemon Juice.
Fold in the blueberries. Pour the batter in a prepared Muffin Pan(either oiled or with muffin wrappers).
Bake in a preheated Oven at 180 degrees for 20-23 minutes till the skewer inserted in the middle comes out clean.