Ultramagnetic for a cookbook? A peculiar choice! ;-)
What kind of cookbook is it?

It's for a large international company. The cookbook is in conjunction with a diversity poster campaign in which employees submit recipes, and as I suggested, stories to accompany them. I chose ultramagnetic because it was friendly, but also because I am using stencils for the letters and pouring in spices. The ultra black, with its width and rounded corners made it a nice choice for this concept. I'm also using the ingredients of each persons recipe to illustrate their story by hand. I thought that the other weights would suffice for the book, but I need something more legible because these submissions could get lengthy.

Here is an example of some of the work I've been doing by hand, which I didn't want to show because I'm not asking for a critique, but I guess if you all recoil at the thought of using this face for a cookbook maybe I should give it some context.

I guess you're aware Ultramagnetic is a family member of Alternate Gothic (old Morris Benton Design).

So News Gothic, Franklin Gothic, Trade Gothic, Benton Sans -- all those classic American Grots are stylisitcally harmonious.

For a serif face, I'm thinking something with a "press gain" look, e.g. my Paradigm Pro Light.

There are a lot of "sturdy/dark" text face recently published.
Dolly was one of the first.

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I used a demonstration with salt in my type design class for several years: pour salt in letter shape, photograph, make high contrast in Photoshop, import into FontLab, autotrace, et voilà, "Blur".

For a similar/contrasting feel, maybe Slimbach (http://new.myfonts.com/fonts/itc/slimbach/alternate_cuts.html) or the more playful Arbiter (http://new.myfonts.com/fonts/berthold/arbiter-bq/).
Or, as Nick noted, something which can give a "press gain" feel, so no thin or sharp serifs, but something slabby and without too much contrast.

By the way, I like the sample you posted :-) I asked about the type of cookbook just to better suggest something appropriate, given the peculiarity of Ultramagnetic in such context.

Thank you both for the help! Now onto the grid..