Potato, Leek, and Pea Soup

1 . Stage

Melt butter in a large pot over medium-high heat. Cook and stir leeks in the melted butter until tender, 5 to 7 minutes.

2 . Stage

Stir potatoes and chicken broth into the leeks and bring to a boil; reduce heat to medium-low, cover the pot, and simmer until potatoes are tender, about 12 minutes.

3 . Stage

Stir peas and tarragon into the soup; simmer until peas are tender, about 5 minutes.

4 . Stage

Pour the soup into a blender, filling the pitcher no more than half full.

5 . Stage

Hold down the lid of the blender with a towel and carefully start the blender, using a few quick pulses to get the soup moving before leaving it on to puree. Puree in batches until smooth and pour into a clean pot. Alternately, you can use a stick blender and puree the soup in the pot.

6 . Stage

Pour milk into the pureed soup and bring to a simmer over medium heat until heated through. Season with salt and black pepper.