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1
Season the beef generously with salt and pepper.
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2
Sprinkle 2 tablespoons of the flour evenly over the meat.
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3
Heat the olive oil in a large heavy saucepan or Dutch oven over medium-high heat.
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4
Add the beef in a single layer without crowding the pan (work in 2 batches if necessary) and cook, turning, until browned on all sides.
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5
Remove the beef from the pan and reserve.
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6
Add the beer to the pan and use a wooden spoon to scrape up any browned bits stuck to the bottom of the pan.
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7
Bring the liquid to a boil and cook until it is reduced by half; return the beef to the pot and add the potatoes, onions, carrots, celery stalk, broth and 1 cup water.
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8
Bring to a boil, reduce the heat to a very low simmer, cover and cook until the beef is very tender, 1 1/2 to 2 hours.
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9
In a small bowl, mash the butter with the remaining 3 tablespoons flour until smooth.
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10
While whisking the liquid, drop small pieces of the butter paste into the stew, whisking until each piece dissolves.
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11
Continue adding the butter paste until it is used up and completely dissolved into the stew.
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12
Add the peas and continue cooking until the stew is thickened and the peas are cooked, about 5 minutes.
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13
Taste and season with salt and pepper (about 1 1/2 teaspoons salt and 3/4 teaspoon pepper).
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14
Ladle the stew into individual bowls and garnish with the chopped celery leaves and sliced scallions, if using.