Listen to tonight's class, "Melting Cheese on Shabbat,"
here.
Follow along with the sources
here.
For further research:
1) Read the full
teshuvah from
Shu"t Heshev HaEfod (1.34), from which we quoted in the class,
here.
2) Several months ago we dealt with the other issue related to grilled cheese sandwiches - making toast on Shabbat. Listen to that class
here.