Place potatoes in a 2-quart saucepan and cover with water; bring to a boil over high heat. Reduce heat to low, cover and simmer 10 minutes. Add green beans and simmer 5 to 8 minutes longer or until vegetables are tender. Drain.
Combine olive oil, lemon juice, mustard and TABASCO® Sauce in a large bowl and mix well. Add potatoes and green beans and toss until well blended; stir in feta. Serve salad warm or cold.
Makes 4 servings.