Something like this :
function load_recipe_category_filter( $field ) {
$terms = get_terms( array(
'taxonomy' => 'recipe_category',
'hide_empty' => false
) );
if ( !empty($terms) ) {
foreach( $terms as $term ) {
$field['taxonomy'][] = 'recipe_category:'.$term->slug;
}
}
return $field;
}
add_filter('acf/load_field/key=field_5899e67cc9f5fff', 'load_recipe_category_filter');