How to make ERB or ERUBI escape HTML in the template without escaping the entire template - NOT RAILS

I'm using ERB or ERUB or Tilt here outside of Rails and I want to make my HTML templates work like rails where stuff is HTML escaped by default.

e.g.

<!-- file.html.erb --><h1>Hello <%= name %></h1>

When I render this, if name is <b>Pat</b>, then the HTML sent to the browser is:

<h1>Hello <b>Pat</b></h1>

I'd like it to render this:

<h1>Hello &lt;b&gt;Pat&lt;/b&gt;</h1>

And I'd like that behavior to be the default anytime <%= is used.

I'm trying Tilt, but when I do Tilt.new("file.html.erb",escape_html: true) it escapes the entire file, rendering <h1>Hello <b>Pat</b></h1>

I tried reading Rails' source to figure this out, but it's highly abstracted and wondering if anyone reading this happens to know how to achieve this.