Today's Vowelburger comes with:
An M bun, Tomatoes and an H bun...
Your options today are:
A - "Hamilton", i.e MATH (Hamiltonian cycles, named after the Irish mathematician, William Hamilton)
E - "Crystal", i.e. METH (the drug)
U - "Mario", i.e. MUTH (a mammoth-like enemy in the Mario games)
O - "Luna", i.e. MOTH (a variety of moth)
Y - "Atlas", i.e. MYTH (the titan from Greek mythology)