How to mention username in bot message

Question

I'm trying to have the user tagged instead of the ID mentioned (I've tried ${user.username} ) but it still doesn't actually mention the said user that the command runs on

Currently the command is $cake " User tag " but the bot won't physically mention them instead just write either their username or include there discriminator at the end.

So the code is

      recentUsers.push(message.author.id);
  setTimeout(() => {
    recentUsers.splice(recentUsers.indexOf(message.author.id), 1);
  }, COOLDOWN * 60 * 60 * 1000);

  message.channel.send({
    embed: {
      color: Cuckbot.colors.GREEN,
      description: `🍰 You have given one cake to ${user.id} 🍰`

Answer 1

If you try to send it like this (instead of user.id , just user ) :

description: `🍰 You have given one cake to ${user} 🍰`

It will convert the user to a String, and that conversion (with DiscordJS) makes it mentionable.
I'm not sure if it will actually mention the user (with the notification) but it will definitely make it clickable.