Laravel Display data from a different table

I am trying to display all the records from my orderItems table but it is displaying data from my products table. How would I switch this round? Have I done my relationships backwards?

desired results Display all order items from OrderItems table

**Product Model **

    <?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use App\Models\OrderItem;

class Product extends Model
{

    use HasFactory;
    protected $fillable = [
        'item_name', 'size', 'toppings','price',
    ];

    public function orderItem() {
        return $this->belongsTo(OrderItem::class,);

    }



}

**OrderItem Model **

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use App\Models\Product;

class OrderItem extends Model
{

    use HasFactory;
    protected $fillable = ['product_id'];


    public function products_rel(){
      return $this-> hasMany(Product::class );

    }
    public function Order(){
    return $this->hasMany(Order::Class);
}
}

orderItem Table

    public function up()
{
    Schema::create('order_items', function (Blueprint $table) {

        $table->id();
        $table->foreignId('product_id');

        $table->timestamps();
    });
}

Products Table

    public function up()
{
    Schema::create('products', function (Blueprint $table) {
        $table->id();
        $table->timestamps();
        $table->foreignId('order_item_id');

        $table->string('name');
        $table->string('size');
        $table->float('price');
        $table->foreignId('topping_id')->nullable();



    });
}

orderItem Controller

 <?php

namespace App\Http\Controllers;
use App\Models\Order;
use App\Models\OrderItem;
use App\Models\Product;
use Illuminate\Http\Request;

class OrderItemsController extends Controller
{

    public function index()
    {


   $orderItems = OrderItem::all();
    return view('basket', ['orderItems'=> $orderItems]);
    }

    public function  create()
    {
        return view('welcome');
    }

    public function store ()
    {
    request()->validate([
        'product_id'=> 'required',

    ]);




        OrderItem::create([

            'product_id' =>request('product_id'),
        ]);

    }

}

output html

<table id="checkout">
    <tr>
    <th>Product</th>
    <th>Size</th>

    <th>Price</th>
    </tr>
    @foreach($orderItems as $orderItem)
        @foreach($orderItem->products_rel as $related_product)
            <tr>
            <td>{{$related_product->name}}</td>
            <td>{{$related_product->size}}</td>

            <td>{{$related_product->price}}</td>
        </tr>


        @endforeach
    @endforeach

</table>