  We study homogeneous nucleation from a deeply quenched metastable liquid to a
spatially modulated phase. We find, for a general class of density functional
theories, that the universally favored nucleating droplet in dimensions $d \geq
3$ is spherically symmetric with radial modulations resembling the layers of an
onion. The existence of this droplet has important implications for systems
with effective long-range interactions, and potentially applies to polymers,
plasmas, and metals.
