The phrase "simple sandwich" refers to a sandwich that is plain and uncomplicated. It usually consists of just a few basic ingredients, without any fancy or complicated additions. Full definition
My kids tend to like simple sandwiches so I chose a few of their favorite ingredients to make something easy yet flavorful. (makingtimeformommy.com)
A quick and simple sandwich recipe made with handful of wholesome ingredients, summer greens, and finished with feta cheese. (ruchiskitchen.com)
Treat yourself to a wonderfully simple sandwich (on house - made bread, of course), or walk out with a whole chicken for the best weeknight dinner you didn't cook. (bonappetit.com)