In theme versions 4.3.0+ (and the Feast Plugin 3.4.2+), we've removed the h1 from the side-wide header. This is because h1's should be page-specific, not site-wide.
All posts and categories have proper h1 tags, however, the homepage does not. You will need to add an h1 tag to the "Homepage: Top" section.
To do this, go to Admin > Appearances > Widgets > Homepage Top > add a "Custom HTML" widget at the top with the following:
<h1>Bake your cake from scratch, not your blog</h1>
Replace the h1 content with your site's tagline.
Do not use a "widget title".
Q: Why does the homepage need an h1?
While not explicitly defined in Google's SEO Starter Guide, the SEO community widely considers the presence of an h1 tag to be a basic SEO requirement on each page.
This is what Google's guide has to say on heading tags.
Q: I don't like the look of this and want to hide it, is that okay?
This h1 tag should be descriptive of your site in general. If you don't want to use your site title, you can use a site tagline, or any text describing what your site is about.