Update custom post meta from add_menu_page

Hi,

I have a custom post called ‘Recipes’ with ‘menu_number’ meta. I can change this meta from custom post page perfectly:

add_action('save_post', 'recipes_save_extras');
function recipes_save_extras(){
    global $post;
    [...]
    update_post_meta($post->ID, "menu_number", $_POST["calorias"];
}

And I want to update this meta from a admin menu page where I show all recipes and I want to assign one value. The code is something like this but I dont know how to implement:

<?php
add_action('admin_menu', 'myrecetas_create_menu');

function myrecetas_create_menu() {
	//create new submenu
	add_submenu_page( 'edit.php?post_type=myrecetas', 'myrecetas Theme Options', 'myrecetas Options', 'administrator', __FILE__, 'myrecetas_settings_page');
	add_action( 'admin_init', 'myrecetas_register_settings' );
}
function myrecetas_register_settings() {
	register_setting( 'myrecetas-settings-group', 'myrecetas_menu_number' );
}
function myrecetas_settings_page() {
?>
<div class="wrap">
<h2>myrecetas Theme Settings</h2>
<form id="landingOptions" method="post" action="????">
    <?php settings_fields( 'myrecetas-settings-group' ); ?>
    <table class="form-table">

        <tr valign="top">
        <th scope="row">Primero:</th>
        <td>
          <select name="myrecetas_id">
            <?php
            global $post;
            $args = array( 'post_type' => 'myrecetas','myrecetas-menu'=>'primero','posts_per_page' => -1 , 'orderby' => 'date');
            $lastposts = get_posts( $args );
            $i=0;
            foreach ( $lastposts as $post ) :
              setup_postdata( $post );
              echo "<option value='".$post->ID."'>".get_the_title()."</option>";
            endforeach;
            wp_reset_postdata(); ?>
         </select>
        </td>
        </tr>
        <tr valign="top">
        <th scope="row">Number:</th>
        <td>
       		<input type="text" name="myrecetas_menu_number" value="<?php print get_option('myrecetas_menu_number'); ?>" />
       	</td>
       	</tr>
    </table>
    <p class="submit">
    <input type="submit" class="button-primary" value="<?php _e('Save Changes') ?>" />
    </p>
</form>
</div>
<?php } 

add_action('save_post', 'update_myrecetas_post_meta'); 

function update_myrecetas_post_meta(????){
    $id=$_POST["myrecetas_id"];

     update_post_meta($id, "menu_number", get_option('myrecetas_menu_number'));
}  

?>