diff --git a/plugin_type_example/src/Plugin/Sandwich/ExampleMeatballSandwich.php b/plugin_type_example/src/Plugin/Sandwich/ExampleMeatballSandwich.php
index 505e53c..9df63c7 100644
--- a/plugin_type_example/src/Plugin/Sandwich/ExampleMeatballSandwich.php
+++ b/plugin_type_example/src/Plugin/Sandwich/ExampleMeatballSandwich.php
@@ -2,8 +2,11 @@
 
 namespace Drupal\plugin_type_example\Plugin\Sandwich;
 
-use Drupal\plugin_type_example\SandwichBase;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
 use Drupal\Core\StringTranslation\StringTranslationTrait;
+use Drupal\Core\StringTranslation\TranslationInterface;
+use Drupal\plugin_type_example\SandwichBase;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**
  * Provides a meatball sandwich.
@@ -29,9 +32,10 @@ use Drupal\Core\StringTranslation\StringTranslationTrait;
  *   calories = "1200"
  * )
  */
-class ExampleMeatballSandwich extends SandwichBase {
-  // Include Drupal\Core\StringTranslation\StringTranslationTrait in order to
-  // so we can use $this->t() to translate strings in our plugin.
+class ExampleMeatballSandwich extends SandwichBase implements ContainerFactoryPluginInterface {
+
+  // Use Drupal\Core\StringTranslation\StringTranslationTrait to define
+  // $this->t() for string translations in our plugin.
   use StringTranslationTrait;
 
   /**
@@ -51,23 +55,35 @@ class ExampleMeatballSandwich extends SandwichBase {
   /**
    * {@inheritdoc}
    */
-  public function __construct(array $configuration, $plugin_id, $plugin_definition) {
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+    // This class needs to translate strings, so we need to inject the string
+    // translation service from the container. This means our plugin class has
+    // to implement ContainerFactoryPluginInterface. This requires that we make
+    // this create() method, and use it to inject services from the container.
+    // @see https://www.drupal.org/node/2012118
+    $sandwich = new static(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $container->get('string_translation')
+    );
+    return $sandwich;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, TranslationInterface $translation) {
+    // Store the translation service.
+    $this->setStringTranslation($translation);
     // Store the day so we can generate a special description on Sundays.
     $this->day = date('D');
+    // Pass the other parameters up to the parent constructor.
     parent::__construct($configuration, $plugin_id, $plugin_definition);
   }
 
   /**
-   * Place an order for a sandwich.
-   *
-   * This is just an example method on our plugin that we can call to get
-   * something back.
-   *
-   * @param array $extras
-   *   Array of extras to include with this order.
-   *
-   * @return string
-   *   A description of the sandwich ordered.
+   * {@inheritdoc}
    */
   public function order(array $extras) {
     $ingredients = array('meatballs', 'irresistible marinara sauce');
diff --git a/plugin_type_example/src/SandwichInterface.php b/plugin_type_example/src/SandwichInterface.php
index 98a32bf..e8a5fe3 100644
--- a/plugin_type_example/src/SandwichInterface.php
+++ b/plugin_type_example/src/SandwichInterface.php
@@ -40,6 +40,9 @@ interface SandwichInterface {
   /**
    * Place an order for a sandwich.
    *
+   * This is just an example method on our plugin that we can call to get
+   * something back.
+   *
    * @param array $extras
    *   An array of extra ingredients to include with this sandwich.
    *