Like the earth, a sandwich is made of layers and gathers its strength from its meaty core, which pushes condiments toward the crust to erupt and bury fingers in deliciousness. Let rivers of mayo magma run with today's Groupon: for $5, you get $10 worth of Vietnamese sandwiches and drinks at Go Deli in Renton.

Go Deli specializes in Vietnam's answer to the hoagie, the banh mi—serving the signature sub in 17 separate flavors ranging from tame to adventurous. Nestled within 10-inch french baguettes baked fresh daily, each of Go Deli's saigon submarines comes festooned with the house daikon-and-carrot pickles, jalapeños, cilantro, french mayo, soy sauce, and a periscope so that ingredients can view their progress down eaters' gullets. Picky palates can stick with straightforward, succulent protein fillings such as grilled chicken ($2.99) and grilled pork ($2.99), and more intrepid incisors can sink themselves into a sardine variant ($2.99) or the Go Combo ($2.99), a slew of sliced jambon, paté, and head cheese. The menu also lists a selection of traditional deli sandwiches ($3.89–$4.39) and potables, including Vietnamese-style iced coffee ($2.49 for regular, $3.49 for large) and bubble teas in lychee, strawberry, green tea, and hermetically sealed varieties ($3).