Here's a video tutorial that explains how to use Lark's meal logging feature:
If you're unable to view the video, here are the steps in written form:
1. Open your Lark application.
2. Select the "+" icon in the bottom right corner of the main chat screen.
3. Select "Add data..."
4. Select "meal."
5. Add the items that you ate
6. Select the green Save button next to the item after you finish typing the name of your food item (if you forget to hit Save, it won't be recorded to your meal log)
7. Select Done