Take sago in a pan, add in water and bring it to a boil, simmer till it is cooked. Drain it and rinse in cold water. Set aside.
Take agar agar and add in 1 cup of water, soak for 15 mins. Now heat it and mix till it is melted.
Take sugar, mango pulp in a sauce pan and heat it.
Add in agar agar and mix well.
Add in sago and mix well. Add lemon juice and mix well
Pour this into mould and set for 4 to 6 hours.
Serve.
Notes
Cook sago till it is completely transparent. Drain and rinse in cold water to remove excess water.
Use ripe mangoes for best taste. Alphonso mango pulp works great. You can use canned mango pulp as well.
Adjust sugar as per your taste.
Gelatin can be used as well. Use 1.5 tblspn of gelatin instead of china grass. Soak the gelatin in ½ cup of cold water for 10 mins, then heat gently till it is melted and use in the recipe.