  We present deep Spitzer-IRS low-resolution (lambda/Delta lambda ~ 100) 5-35
micron spectroscopy of the edge-on disk ``the Flying Saucer'' (2MASS
J16281370-2431391) in the Ophiuchus molecular cloud. The spectral energy
distribution exhibits the characteristic two-peak shape predicted for a
circumstellar disk viewed very close to edge-on. The short-wavelength peak is
entirely due to photons scattered off the surface of the disk, while the
long-wavelength peak is due to thermal emission from the disk itself. The
Spitzer spectrum represents the first spectroscopic detection of scattered
light out to 15 micron from a bona-fide, isolated edge-on disk around a T Tauri
star. The depth and the wavelength of the mid-infrared "valley" of the SED give
direct constraints on the size distribution of large grains in the disk. Using
a 2D continuum radiative transfer model, we find that a significant amount of
5-10 micron-sized grains is required in the surface layers of the disk at radii
of 50-300 AU. The detection of relatively large grains in the upper layers
implies that vertical mixing is effective, since grain growth models predict
the grains would otherwise settle deep in the disk on short time scales.
Additionally, we tentatively detect the 9.66 micron S(3) line of H2 and the
11.2 micron emission feature due to PAHs.
