SINGAPORE, July 8 -- Brace yourselves, Singapore - McDonald's is going full-on local this National Day, and they're bringing the claws out.

From July 10, the fast-food giant is joining forces with chilli crab royalty Jumbo Seafood to unleash the Chilli Crab Sauce Burger - and yes, it's as saucy as it sounds.

In this first-ever mash-up between the golden arches and Singapore's chilli crab OG, fans can choose between the Chilli Crab Sauce Chicken Burger or the Chilli Crab Sauce Prawn Burger. Both are served in fluffy brioche buns, topped with fresh lettuce, and smothered in a tangy, savoury-sweet sauce inspired by Jumbo's award-winning recipe.

Prawn lovers, go wild: the seafood version comes with one or two prawn patties and a generous h...