The tradition names wheat, masoor and jaggery as the daan for Mangal, and its day is Tuesday.
You decide how much to give, in kilos or grams. The amount follows from that weight at the temple's current rate, so you know what your money buys and how much of it.
The daan is made with a sankalp in your name, gotra and place. The temple's pandit ji takes the sankalp and makes the daan at the right muhurat.
The amount is charged 5 days before the daan date, so the temple can buy the items in time.
After the daan, the temple sends a photo and the details of the sankalp.
Gehun, Masoor aur Gud