Start by washing and trimming the green beans.

Peel and dice the potatoes into small cubes.

Place the diced potatoes into a large pot of boiling salted water and cook for about 5 minutes.

After 5 minutes, add the green beans to the pot and cook until both are tender, about 10 more minutes.

Drain the vegetables in a colander.

In a skillet, heat the olive oil over medium heat and add minced garlic, sautéing until fragrant, about 1 minute.

Add the drained potatoes and green beans to the skillet and toss together.

Season with salt, pepper, and lemon juice if desired. Serve warm.