--- a/piecrust/baking/worker.py	Tue Nov 28 21:27:57 2017 -0800
+++ b/piecrust/baking/worker.py	Tue Nov 28 21:28:15 2017 -0800
@@ -80,6 +80,15 @@
         source_name, item_spec = job['job_spec']
         logger.debug("Received job: %s@%s" % (source_name, item_spec))
 
+        # Check for special jobs.
+        if source_name == '__special__':
+            if item_spec == 'populate_template_cache':
+                for eng in self.app.plugin_loader.getTemplateEngines():
+                    eng.populateCache()
+            else:
+                raise Exception("Unknown special job: %s" % item_spec)
+            return {}
+
         # Run the job!
         job_start = time.perf_counter()
         pp = self.ppmngr.getPipeline(source_name)