Baja Fresh Mexican Grill is testing consumer reaction to a more upscale restaurant in Irvine – a prototype eatery that offers bolder food flavors, a more intimate dining experience and cocktails. The restaurant, which underwent a massive remodel last winter, will soon add margaritas and Mexican beer to the menu — a first for the Cypress-based fast-casual chain. The alcohol is expected to compliment new food additions at the prototype restaurant, which features dishes such as Kogi Korean BBQ