whisk
fruste
FROO-stah
'Frustare' is the verb (to whisk). 'La frusta' also means 'whip' — same word, different context.
Monta la panna con la frusta elettrica finché non è ferma.
She whips the cream with the electric whisk until it is stiff.
Sbatti le uova con la frusta per amalgamarle bene.
Beat the eggs with the whisk to blend them well.