Step 1: Understanding the Concept:
Chenna is fresh, unripened curd cheese made from cow or buffalo milk by curdling it with an edible acid like lemon juice or vinegar. It is the foundation of most Bengali desserts.
Step 2: Detailed Explanation:
Four popular Chenna sweets are:
1. Rasgulla: Spongy balls of chenna cooked in a light sugar syrup. They must be porous and elastic.
2. Sandesh: Made by kneading fresh chenna with sugar or jaggery (Nolen Gur) and often flavored with cardamom or saffron. It is a dry sweet.
3. Rasmalai: Flattened discs of chenna (similar to rasgullas) which are soaked in a thickened, sweetened, and flavored milk known as 'Rabri'.
4. Cham Cham: These are colorful, often oval-shaped chenna sweets that are denser than rasgullas and sometimes coated with desiccated coconut or topped with mawa (khoya).
Step 3: Final Answer:
The sweets are Rasgulla, Sandesh, Rasmalai, and Cham Cham.