Sweet Lemon Pickle (Nimbu ka Meetha Achar)

1 kg lemons (thick skinned)
750 gm sugar
62.5 gm salt
2 cinnamon sticks
6 cloves
4 black cardamoms
2 whole red chiles, dried
3 tsp powdered red chile (optional)
3 tsp garam masala (optional)

Grind the cloves, cardamoms, one cinnamon stick.  Wash the lemons and dry thoroughly. Slice the lemons into 1/4" thick rounds.  Put into a completely dry pressure cooker, and place on low heat for 10 minutes.  Now increase the heat to medium, and wait for one whistle.  Remove the pressure cooker from the flame immediately after the whistle.  Let the pressure release naturally.  Open the pressure cooker, and add in all the remaining ingredients.  Pour into a dry, airtight glass jar.  Place in the sun for 2 days.