How to apply the "plugins {}" block from inside a buildSrc plugin?

If I try to put it in my Convection, I keep getting:

No signature of method: com.myOrg.build.MyOrganizationPluginConvention.plugins() is applicable for argument types:…

Currently the ‘plugins {…}’ block is limited to use within a build script. If you need to apply a plugin from another plugin you’ll have to use the ‘Project.apply()’ method.