Spring Boot - how to process JSON data with nested objects?

Question

I'm trying to make a recipe app and I have these models:

Recipe

public class Recipe {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer id;

    private String title;

    private Integer prepTime;

    private Integer cookTime;

    @OneToMany(fetch = FetchType.LAZY)
    private ArrayList<Ingredient> ingredients;

    private String instructions;

    private String notes;

    public Recipe(String title, Integer prepTime, Integer cookTime, ArrayList<Ingredient> ingredients, String instructions, String notes) {
        this.title = title;
        this.prepTime = prepTime;
        this.cookTime = cookTime;
        this.ingredients = ingredients;
        this.instructions = instructions;
        this.notes = notes;
    }

Ingredient

public class Ingredient {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer id;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "product_id")
    private Product product;

    private Integer quantity;

    private Integer price;

    public Ingredient(Product product, int quantity, Integer price) {
        if (product != null) {
            this.product = product;
        }
        this.quantity = quantity;
        this.price = Objects.requireNonNullElseGet(price, () -> this.quantity * this.product.getPricePerUnit());
    }

Product

public class Product {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer id;

    private String name;

    private String unit;

    private Integer pricePerUnit;

    public Product(String name, String unit, Integer price) {
        this.name = name;
        this.unit = unit;
        this.pricePerUnit = price;
    }

I'm trying to create a new recipe and ingredients using existing products in my database, so I need to:

1. Get product ids from the JSON
2. Look up the product ids in the ProductRepository and return the relevant Product
3. Use those products in the Ingredients constructor to create a list of ingredients
4. Pass that list of ingredients to the Recipe constructor

My problem is how to reflect all this in my Recipe controller:

@PostMapping("/add")
    public void addRecipe(@RequestBody ??? data)

This is my Json data for testing:

{
    "title": "Test Recipe",
    "prepTime": 20,
    "cookTime": 50,
    "ingredients": [
        {
            "product": 1,
            "quantity": 30
        }
    ],
    "instructions": "blah blah",
    "notes": "etc"
}

Ideally I'd like to pass multiple parameters to @RequestBody (the list of product ids, the values for the remaining Ingredient fields, and the values for the remaining Recipe fields). Then I could proceed from step 2 above. The problem is that @RequestBody can't accept more than 1 parameter. Is there any way to make my controller find the product IDs first and create the Ingredients before trying to create a Recipe?

I have seen a potentially linked question here but it doesn't deal with where/how I can look up the Product id and get the Product before creating the Ingredient.