Cook the Potatoes: In a medium-sized pot, bring salted water to a boil. Add the diced potatoes and cook for 10-12 minutes, or until they are just tender but not falling apart. Drain the potatoes and set aside.
Sauté the Onions: In the same pot, melt the unsalted butter over medium heat. Add the finely diced onion and sauté for about 5 minutes, or until the onion becomes translucent and slightly golden.
Make the Cream Sauce: Pour the heavy cream into the pot with the sautéed onions. Stir gently and bring the mixture to a simmer. Allow it to cook for 3-4 minutes, stirring occasionally, until the cream begins to thicken slightly.
Add the Peas and Potatoes: Add the frozen peas and the cooked potatoes to the pot. Stir gently to coat the vegetables with the creamy sauce. Continue to cook for another 3-4 minutes until the peas are heated through and the sauce has thickened to your desired consistency.
Season and Flavor: Season the creamed peas and potatoes with salt, pepper, and the dried dill. Taste and adjust the seasoning as needed. The dill adds a lovely hint of freshness that complements the creamy richness of the dish.
Serve: Remove from heat and transfer the creamed peas and potatoes to a serving dish. Serve warm, garnished with a sprinkle of fresh dill if desired. Enjoy this comforting side dish alongside your favorite main courses.