Dishes from subcategory

// WP_Query arguments
$args = array(
	'post_type'              => array( 'dishes' ),
	'order'                  => 'ASC',
	'orderby'                => 'menu_order',
	'tax_query'              => array(
		array(
			'taxonomy'         => 'dish-category',
			'terms'            => array( 'Lunchkaart', ' Avondkaart', ' Dessertkaart' ),
			'field'            => 'term_id',
			'operator'         => 'IN',
			'include_children' => true,
		),
	),
);

// The Query
$query = new WP_Query( $args );