1 liter whole milk
2-3 tablespoons lemon juice (or vinegar)
1 cup sugar
4 cups water
1 teaspoon cardamom powder (optional)
In warm milk, add lemon juice to cause it to curdle, filter, and mix until it's smooth.
Using the chenna, form tiny, smooth balls. To make sugar syrup, bring sugar and water to a boil and dissolve the sugar.
Place balls in boiling syrup, cover, and simmer until the balls have doubled in size, 15 to 20 minutes.
Before serving, allow the rasgullas to chill in syrup.