diff --git a/functions/src/index.ts b/functions/src/index.ts
index ef18759..784d355 100644
--- a/functions/src/index.ts
+++ b/functions/src/index.ts
@@ -1,4 +1,5 @@
 export {api} from './api';
+export {menu} from './menu';
 export {sgyauth} from './sgyauth';
 export * as sgyfetch from './sgyfetch';
 export * as weather from './weather';
diff --git a/functions/src/menu.ts b/functions/src/menu.ts
new file mode 100644
index 0000000..b17f37a
--- /dev/null
+++ b/functions/src/menu.ts
@@ -0,0 +1,87 @@
+import * as functions from 'firebase-functions';
+import admin from './util/adminInit';
+
+import { DateTime } from 'luxon';
+import { getAlternates } from './util/apiUtil';
+import { getSchedule } from '@watt/shared/util/schedule';
+import { SCHOOL_START, SCHOOL_END } from '@watt/shared/data/schedule';
+
+
+const firestore = admin.firestore();
+
+export const menu = functions.https.onCall(async () => {
+    const now = DateTime.now().setZone('America/Los_Angeles');
+
+    if (now < SCHOOL_START || now > SCHOOL_END) {
+        await firestore.collection('gunn').doc('menu').set({
+            timestamp: new Date().toISOString(),
+            menu: {}
+        });
+        return;
+    }
+
+    const current = (await firestore.collection('gunn').doc('menu').get()).data()!;
+    if (DateTime.fromISO(current.timestamp).plus({ week: 1 }) > now)
+        return;
+
+    const { daysInMonth, month, year } = now.plus({ week: 1 });
+    const { alternates } = await getAlternates();
+    const nutrislice = 'https://pausd.api.nutrislice.com/menu/api';
+    const nutrition = new Map();
+
+    async function getNutrition(day: number) {
+        return await Promise.all(['breakfast', 'lunch'].map(async meal => {
+            const { days } = await fetch(`${nutrislice}/weeks/school/henry-m-gunn-hs/menu-type/${meal}/${year}/${month}/${day}`)
+                .then(res => res.json())
+                .catch(() => []);
+            if (!days) return;
+            const items = days
+                .flatMap((day: any) => day.menu_items)
+                .map((items: any) => items.food)
+                .filter(Boolean);
+            for (const item of items) {
+                nutrition.set(item.name, {
+                    serving: Object
+                        .values(item.serving_size_info)
+                        .every(x => !x) ? null : item.serving_size_info,
+                    nutrition: Object
+                        .values(item.rounded_nutrition_info)
+                        .every(x => !x) ? null : item.rounded_nutrition_info,
+                    ingredients: item.ingredients || null
+                });
+            }
+        }));
+    }
+
+    async function getMenu(date: DateTime) {
+        const { year, month, day } = date
+        const [brunch, lunch] = await Promise.all(['breakfast', 'lunch'].map(async meal => {
+            const { menu_items } = await fetch(`${nutrislice}/digest/school/henry-m-gunn-hs/menu-type/${meal}/date/${year}/${month}/${day}`)
+                .then(res => res.json())
+                .catch(() => []);
+            if (!menu_items) return;
+            return Object.fromEntries(menu_items.map((item: string) => [item, nutrition.get(item) ?? null]));
+        }))
+        return [date.toFormat('MM-dd'), { brunch, lunch }];
+    }
+
+    const days = Array
+        .from({ length: daysInMonth }, (_, i) => DateTime
+            .fromObject({ year, month, day: i + 1 })
+            .setZone('America/Los_Angeles'))
+        .filter(day => {
+            const { periods } = getSchedule(day, alternates);
+            return periods && periods.filter(({ n }) => n === 'B' || n === 'L').length;
+        });
+
+    await Promise.all(Array
+        .from({ length: Math.ceil((days[days.length - 1].day - days[0].day) / 7 + 1) }, (_, i) => 7 * i + days[0].day)
+        .map(getNutrition));
+
+    const menu = Object.fromEntries(await Promise.all(days.map(getMenu)));
+
+    await firestore.collection('gunn').doc('menu').set({
+        timestamp: new Date().toISOString(),
+        menu: { ...current.menu, ...menu }
+    });
+})
\ No newline at end of file