Adapted from Anne Quatrano's Summerland: Recipes for Celebrating With Southern Hospitality (Rizzoli).
Heat a large skillet, preferably cast-iron, over high heat. Swirl in oil; add beans and saute, stirring frequently, until crisp-tender and blistered in places, 8 to 10 minutes. Reduce heat to medium and stir in peas and garlic. Saute just until garlic is fragrant, about 1 minute. Remove from heat, season with salt and pepper, and serve.