Gather all ingredients before starting recipe.

Peel and thinly slice 1/4 of a medium onion.

Melt butter in a medium sized skillet over medium heat and add sliced onion, sauté until the onion becomes translucent, about 4-5 minutes.

Thinly slice the Boston lettuce and coarsely chop the leaves of 2-3 sprigs of tarragon.

Add one cup of frozen peas to the onions and cook for 2-3 minutes.

Add the lettuce and the tarragon, toss to combine, and cook for another 2-3 minutes.