changing Form input's contents from their default 'value'

Say I have a hasOne relationship between two Models, for instance Recipe hasOne User. If I set up the data (recipes contains a user_id field) and bake I will see a beautiful user id drop-down menu in the recipe add screen. The problem is that it displays the user_id, and not a bunch of usernames! Can I change this?

For reference, here is some relevant code, and the html it outputs,
//Views/add.ctp
...
echo $this->Form->input('user_id');

which produces the following html:

<select name="data[Recipe][user_id]" id="RecipeUserId">
<option value="1">1</option>  <option value="2">2</option>
...


The html I would prefer would be more like...
<select name="data[Recipe][user_id]" id="RecipeUserId">
<option value="1">Robert</option>  <option value="2">Paulson</option>
...  
Thanks for any help!

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