Tie cottage cheese in muslin, and squeeze out moisture, grind to a fine paste, add thickened milk and castor sugar and mix well. Spread the cottage cheese mixture on a flat container with raised sides. Flatten the mixture, sprinkle raisins, almonds and a tspn. of castor sugar over it and cover. Boil a pan with 2/3 water filled in it and keep the dish with the cottage cheese on it, to steam cook. Cook for 1 hour or more, till done. Drain out any water that may get in, and allow to cool. Cut into squares or any desired shape. Garnish with rose petals before serving.