Caramelized Onion and Coarse-Grain Mustard Mashed Potatoes

"From the Trenton Times: Caramelized onions practically melt into the warm potatoes, and coarse-grain mustard adds a pretty golden-flecked hue and subtle flavor. Cook time does not include time to make caramelized onions. I have made this using a combination of red potatoes and red gold potatoes and I don't bother to peel them. I also prefer to caramelize the onions in the crockpot on high for 3-4 hours."
photo by I'mPat photo by I'mPat
photo by I'mPat
Ready In:




  • Boil potatoes in a large saucepan over medium heat in salted water to cover for 15 to 20 minutes, or until tender.
  • Drain water. Return to pan to heat for 1 to 2 minutes, shaking occasionally to dry out any remaining water.
  • Add the half-and-half and butter, and heat over medium heat just until the milk starts to simmer.
  • Remove from heat. Add the mustard and onions and mash to desired consistency. Taste and add more mustard if necessary.
  • Add salt and pepper to taste. Serve hot.
  • Note: To caramelize onions, heat 1 Tbsp olive oil in a heavy-based skillet. Add 1 thinly sliced medium yellow onion. Cook and stir over medium heat for 5 minutes until onion starts to soften. Lower heat and sprinkle with 1/4 tsp salt and a pinch of granulated sugar. Cook 20 minutes or until deep golden brown, stirring frequently. Lower heat if necessary to keep onions from burning. These freeze beautifully, so you can make extra to freeze for later use.

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  1. Loved it, scaled back for 3 serves and they were big but all eaten up and I did put a lot more caramelized onion into the mix (nearly 1 cup of caramelized onion and 2 teaspoons of Dijon grain mustard) and used Carisma potatoes which are low GI. Thank you Sonata, made for Name tat Ingredient tag game.
  2. I made this tonight and to be honest I have very mixed feelings about it. I found the ingredients intriguingly different and I rather thought that this would be a recipe that you love or hate. I don't love or hate it. The mustard really removes it from the mashed potato that one expects..but thats why I tried it. I think I would have liked the potato's much more with the caramelized onions or the mustard than I did with both. I think this is worth trying for those who enjoy something a bit off the beaten path and I'm sure that there are those you will fall madly in love with this. Perhaps some more milk and butter would have helped as that were pretty dry (I used Russets). The onion and mustard flavors were quite mild I should add.


After a spending my childhood subsisting on a handful of favorite foods, I became a more adventurous eater in my teens and now enjoy trying new foods. It took a little longer for me to get up my nerve to expand my cooking repertoire beyond the basics, but I'm enjoying branching out, especially now with inspiration from the Recipezaar chefs. One of my goals is to reduce the amount of processed food my family eats, so I'm making an effort to cook more from scratch and use local, seasonal fruits and vegetables.
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