Wash spinach leaves and place them in a saucepan with 1/2 cup on medium heat for 5 minutes. After 5 minutes remove spinach from the saucepan and wash under cold running water. This process is called blanching. Leave spinach in a colander to drain out completely.
Now put all green veggies (peas, chopped beans, chopped green capsicum) in a microwave-safe glass bowl with 1 cup of water and microwave them for 10 minutes (covered).

After 10 minutes take out the bowl and drain water. Let the veggies cool down completely.
Add boiled veggies in a chopper or grinder and grind them into a coarse paste without adding water. Keep it aside.
Chopped sweet potato into 2 -3 parts and put it in a microwave glass bowl with 1 cup of water. Microwave it for 10 minutes (covered).

Drain off the water and let it cool down completely. Grate boiled sweet potatoes and keep them aside.
In a big bowl add grated sweet potatoes, blanched chopped spinach, boiled coarse paste of boiled vegetables with all other ingredients (except white sesame seeds and oil) and mix everything together well.
Keep prepared mixture in the refrigerator for 30 minutes (covered). Grease hands with little oil and make kababs. Coat them with white sesame seeds.

Heat little oil in a pan and place kababs in a pan.
Shallow fry till both sides are golden brown and crisp.
Serve hot with chutneys or ketchup.

Tips:

Washing under cold water helps spinach in retaining it's green colour.
Grating sweet potato gives a perfectly smooth texture to kababs.
You can boil vegetables in a saucepan with 1 cup of water for 10 minutes on medium-low flame.