saltare in padella
to sauté
Saltare means 'to jump' and padella means 'pan', so together it means making the food "jump in the pan" or sauteing it.
cuocere al vapore
to steam
Quite literal, cuocere means 'to cook' and al vapore means 'by steam', English and Italian also share the expression "go at full steam", or andare a tutto vapore
far bollire
to boil
Literally, "to make boil" you can use bollire alone as in L'acqua bolle 'the water is boiling' or metaphorically, your blood can also boil as in: il sangue bolle.