Valor da matriz preenche o valor antigo Laravel 8
<select id="recommended_food" multiple="multiple" size=3 style='height: 100%;' name="recommended_food[]">
@if ($food->recomemded_food)
{{ ($val = 'Fries')
&& $chosen = in_array($val, $food->recommended_food)
? 'selected':null}}
<option value="{{$val}}" {{$chosen}}>{{$val}}</option>
{{ ($val = 'Hot Dogs')
&& $chosen = in_array($val, $food->recommended_food)
? 'selected':null}}
<option value="{{$val}}" {{$chosen}}>{{$val}}</option>
{{ ($val = 'Hamburgers')
&& $chosen = in_array($val, $food->recommended_food)
? 'selected':null}}
<option value="{{$val}}" {{$chosen}}>{{$val}}</option>
@endif
</select>
Tyagi420