Does Thiruvananthapuram have a signature halwa? It was a social media post that took me to Kadakkavoor, nearly a one-hour drive from the city, where a family has been making and selling homemade halwa for over four decades now. At Chekkalavilakom junction, behind the now-defunct Kadakkavoor market, is Sheeja Nivas, where Shibu Sudevan is carrying forward the legacy of the …