diff --git a/exercises/concept/lasagna-master/lasagna-master.js b/exercises/concept/lasagna-master/lasagna-master.js
index ade3b9d174..ae1a93366b 100644
--- a/exercises/concept/lasagna-master/lasagna-master.js
+++ b/exercises/concept/lasagna-master/lasagna-master.js
@@ -10,3 +10,62 @@
  *   ...
  * }
  */
+
+
+/**
+ * Determines whether the lasagna is done based on the
+ * remaining time on the timer.
+ *
+ * @param {number} time time left on the timer
+ * @returns {string} cooking status
+ */
+export function cookingStatus(time) {
+  throw new Error('Remove this line and implement the function');
+}
+
+/**
+ * Estimates the preparation time based on the number of layers.
+ *
+ * @param {string[]} layers
+ * @param {number} avgPrepTime
+ * @returns {number} total preparation time
+ */
+export function preparationTime(layers, avgPrepTime = 2) {
+  throw new Error('Remove this line and implement the function');
+}
+
+/**
+ * Calculates how many noodles and much sauce are needed for the
+ * given layers.
+ *
+ * @param {string[]} layers
+ * @returns {Quantities} quantities needed for the given layers
+ */
+export function quantities(layers) {
+  throw new Error('Remove this line and implement the function');
+}
+
+/**
+ * Adds the secret ingredient from the ingredient list that a
+ * friend provided to your ingredient list.
+ *
+ * @param {string[]} friendsList
+ * @param {string[]} myList
+ */
+export function addSecretIngredient(friendsList, myList) {
+  throw new Error('Remove this line and implement the function');
+}
+
+/**
+ * Calculates the amounts of ingredients needed for a certain
+ * amount of portions.
+ * Assumes the original amounts were meant for 2 portions.
+ * Does not modify the original recipe.
+ *
+ * @param {Record<string, number>} recipe
+ * @param {number} targetPortions
+ * @returns {Record<string, number>|{}} recipe with amounts for target portions
+ */
+export function scaleRecipe(recipe, targetPortions) {
+  throw new Error('Remove this line and implement the function');
+}