We report a novel method for the preparation and gelation of crystalline emulsions. A periodic array of droplets observed using optical microscopy and Bragg diffraction is created by manually shearing between glass slides disordered premixed emulsions consisting of droplets dispersed in a nonviscoelastic medium. While the sample is sheared, the structure of the uniform highly ordered monodisperse emulsion is permanently immobilized by chemically cross-linking the polymeric emulsifier macromolecules dissolved in the continuous phase. We also describe how the shear procedure leads to the formation of highly monodisperse crystalline foams.