Brand partnership for pastis, a traditional Marseille aperitif, with arch-rival decried as ‘stab in the back’

It is the quintessential pre-dinner apéro enjoyed in the Provençal afternoon sun, as unmistakably southern French as the clicking sound of a game of pétanque.

But the cloudy, aniseed-flavoured aperitif Ricard Pastis is leaving an aftertaste even more bitter than its makers intended in the mouths of some football fans in the southern city of Marseille.