Deleting item from cart session. Laravel

When I add products to my cart through session I want to be able to delete them from my cart one by one. How I'm supposed to do that ? This is my CartController

public function add(Request $request, $id)
{
    $product_from_db = Product::find($id);
    $product = [];
    $product['id'] = $id;
    $product['title'] = $product_from_db->title;
    $product['image'] = $product_from_db->image;
    $product['slug'] = $product_from_db->slug;
    $product['price'] = $product_from_db->price;
    $product['quantity'] = $request->input('quantity');
    $request->session()->push('cart', array_merge((array)Session::get('cart',[]), $product));
    flash()->success('Prekė sėkmingai pridėtą į krepšelį.');
    retu redirect('/prekes');
}

public function show()
{
    $products = session('cart');
    $subtotal = [];
    retu view('cart.show')->with(array(
        'products'    => $products,
        'subtotal' => $subtotal
    ));
}

This is my cart:

                        @foreach($products as $p)
                        <tr>
                            <td class="col-md-6">

                                <div class="media">
                                    <a class="thumbnail pull-left" href="#"> <img class="media-object" src="{{URL::to($p['image'])}}" style="width: 72px; height: 72px;"> </a>
                                    <div class="media-body">
                                        <a style="padding-left: 2%" href="{{URL::to('prekes/'.$p['slug'])}}" class="text-waing"><strong>{{$p['title']}}</strong></a>
                                    </div>
                                </div>

                            </td>
                            <td class="col-md-1" style="text-align: center">
                                <input type="number" class="form-control" id="quantity" value="{{$p['quantity']}}">
                            </td>
                            <td class="col-md-1 text-center"><strong>{{number_format($p['price'], 2, '.', ',')}} €</strong></td>
                            <td class="col-md-1 text-center"><strong>{{number_format($p['price']*$p['quantity'], 2, '.', ',')}} €</strong></td>
                            <td class="col-md-1">
                                <button type="button" class="btn btn-danger">
                                    <span class="glyphicon glyphicon-remove"></span> DELETE ITEM
                                </button></td>
                        </tr>
                        @endforeach

Can you give me some example how I'm supposed to delete item that I want from a cart ?