‘Ah, Master Cromwell!’ More rubs his hands together. ‘I relish you, I do indeed. Now I feel as a nutmeg must do when it's grated. A lesser man – a lesser lawyer – would say, “I have read Tyndale's work, and I find no fault there.” But Cromwell won't be tripped – he casts it back, he asks me, rather, have you read Tyndale? And I admit it. I have studied the man. I have picked apart his so-called translations, and I have done it letter by letter. I read him, of course, I do. By licence. From my bishop.’
— Wolf Hall by Hilary Mante
What is the meaning of "to feel as a nutmeg must do when it's grated"? Irritated?