Meteor.methods({
  my_function: function(arg1, arg2) {
    //Call other asynchronous function and return result or throw error
  }
});

Meteor.methods({
  my_function: function(arg1, arg2) {

    // Set up a future
    var fut = new Future();

    // This should work for any async method
    setTimeout(function() {

      // Return the results
      fut.ret(message + " (delayed for 3 seconds)");

    }, 3 * 1000);

    // Wait for async to finish before returning
    // the result
    return fut.wait();
  }
});