6corn cobs, soaked in cold water for 10 minutes1 tbspgrapeseed or vegetable oil180 gmbutter, at room temperature2 tbspunhulled tahini2 tbspfish sauce, or to taste2 tbspfinely chopped corianderJuiceof 1 lime, plus lime cheeks, to serveTo serve:dried chilli flakes or ground chilli (optional)
Heat a barbecue or char-grill pan to high heat. Peel back the corn husks but don’t detach them (if the corn has a lot of husks, discard some of the outer leaves), remove silk and drizzle corn with oil, season to taste, then fold the husks back over the corn. Grill corn, turning occasionally, until charred and tender (10-15 minutes).
Meanwhile, beat butter in a bowl until pale and fluffy, then stir in remaining ingredients.
To serve, peel back corn husks and top each cob with a dollop of sesame butter and a squeeze of lime juice and season with chilli to taste.