Put the blueberries, ½ cup of sugar, lemon juice and 1 cup of water into a pan and bring to boil, stirring continuously. Boil for 3 min. Sift together the flour, baking-powder and salt, add the 2 tablesp. sugar. Cut in the fat and mix with milk to make a soft dough. Drop the dough over the boiling fruit, cover and simmer for 10 min. without raising the lid.