Into a mixing bowl. add the yogurt and pesto and mix well.
Add the paneer cubes, the capsicum pieces and the onion pieces and coat them well with the yogurt pesto marinade.
Cover the bowl and leave it in the refrierator to marinate atleast for 30 minutes ( overnight is perfect)
Remove the marinated veggies and paneer.
Heat up the Grill pan and brush it with oil
Place the veggies and the paneer on the grill.
Once the grill marks have formed on one side, turn over the veggies and paneer to the other side.
Remove the grilled paneer and veggies when done and set aside.
To assemble the sandwich, spread a tbsp of pesto on the slices of bread.
Place the veggies and paneer layered upon one slice of bread and cover with the other.
Enjoy the stacked sandwich for lunch.
Notes
The nut based pesto will burn much faster on the grill and hence I choose a nut free one. Also nut free is safer in a school enviornment.Alter the salad veggies based on your preference.