Splitting Orders

Site URL: https://mccallsmarket.com

I have a physical product (food item) and created 2 variants for dietary (meat, veg). But, want the customer to split the order (total qty - 4, 2 meat, 2 veg). How do I do this? 

If it's not something that you need to keep hard inventory on, and if it doesn't affect pricing, perhaps you can have customer state preference in a form that goes with this product?