Because the garlic cloves are boiled with the potatoes, they make their presence felt sweetly rather than shoutily, and the Parmesan provides a gentle tang. Put the prepared potatoes and garlic ...
add the garlic and bring to a very gentle simmer, stirring constantly. Add around 100ml/3½fl oz of the pasta cooking water and the grated Parmesan and stir until melted. Season with salt and pepper.