Salmon Hash with Creamy Mustard Sauce

I was all set to make this Salmon Hash from Plenty by Diana Henry for last week's Happy, Healthy theme for I Heart Cooking Clubs. Salmon and greens are certainly a good way to "healthy up" a breakfast hash. When I took a closer look at the ingredients, I realized that four of them (potatoes, onion, leafy greens and lemon) were on our list for January's Mystery Box Madness challenge for this