In a large stock pot fill a little over 1/2 full with water and place your washed potatoes into the pot. Bring to a boil and continue to boil your potatoes for 15-20 minutes.
Dice your carrots, 1/2 yellow onion, and mince your 3 cloves of garlic. In a large skillet add 1 Tbsp. olive oil, the diced yellow onion, and minced garlic.
Then add in your ground mustard, oregano, cayenne pepper, salt, and pepper. Mix thoroughly and cook for 2 more minutes on medium heat. After, add in the frozen corn and peas.