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Pat the lamb dry and season with salt and pepper. In a large Dutch oven or heavy pot, heat one tablespoon of oil over medium-high heat until hot and shimmering. Brown the lamb in three batches, adding one more tablespoon of oil for each batch. Do not crowd the pan and let the meat develop a brown crust before turning with tongs. It should take 5-8 minutes per batch. Transfer the browned meat to large bowl and set aside.
Add the onions, garlic and 2 tablespoons of water to the pot. Cook until the onions are soft, stirring with a wooden spoon to scrape any brown bits from the bottom of pan, about 5 minutes.
Stir in the tomato paste and cook a few minutes more.
Add the lamb with its juices back to the pan and sprinkle with flour. Stir with a wooden spoon until the flour is dissolved, 1-2 minutes.
Add the Guinness, beef broth, water, bay leaf, rosemary sprig and sugar. Stir with a wooden spoon to loosen any brown bits from the bottom of the pan and bring to a boil. Cover the pot with a lid, turn the heat down to low and simmer for one hour and twenty minutes.
Add the carrots and potatoes to the stew, then cover and continue simmering until the vegetables are cooked and the meat is very tender, 30-40 minutes. (Be sure to stir a few times to prevent vegetables from sticking to bottom.)
Remove the bay leaf and rosemary sprig, and then taste and adjust seasoning if necessary. If serving right away, add the frozen peas and cook until the peas are warmed through. Otherwise, let the stew cool, then cover and store in the refrigerator until ready to serve. Reheat gently on the stovetop and add the peas right before serving.
Make Ahead: This stew can be made a day or two ahead of time and reheated gently on the stovetop. Just be sure to add the peas right before serving so they stay fresh. Also, the broth will thicken in the fridge so it may be necessary to thin it with a bit of water (add it little by little).
Freezer-Friendly Instructions: The stew can be frozen for up to 3 months. Just omit the potatoes because they don’t freeze well. If you’d like, boil some potatoes separately when you defrost the stew and either add them into the stew or serve them on the side.