McDonald's to test build-your-own burgers

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In the same week McDonald's acknowledged that its customer service is suffering and that it has been introducing too many new menu items too quickly, the fast-food chain is launching a new experiment with premium-quality build-your-own-burgers, The Orange County Register reported.

McDonald's began testing the upscale burgers in restaurants in Laguna Niguel and Illinois, where customers have a choice of more than 20 toppings and sauces, among them guacamole, caramelized onions, and applewood smoked bacon, the Register said.

(Read more: Inside McDonald's $3 billion spending plan)

Diners order their custom burgers using iPad ordering stations inside the restaurants.

To read more about McDonald's latest menu experiment, click here.