Paprika, Green Bean and Potato Stew

Phoebe was a pretty picky eater as a kid, but always made an exception for her mom's paprika-flavored potato stew. The recipe, which originally included chunks of hot dog or sausage, was passed on to Phoebe's mom by a Hungarian girl back in the 70's and Phoebe's mom started using green beans instead of hot dog chunks. Phoebe's family always called this dish paprikash, but a little wikipedia research revealed that paprikash is a chicken and sour cream sauce over noodles, while this dish is actually called paprikás krumpli.

3 tablespoons butter or olive oil
1 yellow onion, chopped
1 1/2 tablespoons paprika
1/4 - 1/2 teaspoon cayenne (optional)
4 cups green beans, chopped into 1" pieces
4 cups Yukon Gold potatoes, cut into 1" cubes
2 cups canned tomatoes (diced or pureed)
3/4 teaspoon salt

Melt the butter in a sauce pan, then saute the onions until softened. Remove from the heat and immediately stir in the paprika and cayenne. Add the rest of the ingredients and enough water to cover the vegetables. Return to the heat and simmer until the potatoes and green beans are cooked, but still tender.