SINGAPORE — “Yes, hello, fruits?” Shouting above the din, vendor Sini Mohamad leans forward into a conga line of office workers edging between dozens of lavishly provisioned stalls in Singapore’s Tekka Market. It is lunchtime, and crowds throng the market as dozens of hawker stalls dish out noodles, rice and curries. Most ignore Mohamad’s appeals. But he keeps at it, alongside stallholders selling meat, fish, vegetables and spices. The lunchtime crowd offers a fleeting chance for butchers and grocers to persuade passers-by to do a bit of grocery shopping before they head back to work, their palettes whetted by the aromas of spices and herbs clinging to the steamy market air.