Remove prepared chhana from cheesecloth, and turn onto a clean surface or cutting board. Knead for about 5 minutes to create a softer, smoother dough.
Place dough in a mixing bowl, and add molasses (or mango, if desired). Mix well with a wooden spoon for about 5 minutes, until colors merge. Dough will be sticky but smooth. Taste it for sweetness. If desired, add sugar.
Set a medium pan over low heat. Add chhana-molasses dough, and stir frequently for 3 to 5 minutes. The colors will turn a darker brown. Remove dough from heat. While the dough will initially be soft, it will naturally firm up once cooled. Form into four equal balls. Garnish with a pistachio or almond. Alternately, use a mold to imprint a design. Serve at room temperature or chilled.