Thai Beef Salad

1 lb tender beef steak, such as top sirloin.

For the salad:
1/2 red onion thinly sliced
1 tomato, cut into wedges
1 cucumber, peeled, cut lengthwise in half and thinly sliced
1-2 Thai bird’s-eye chilies or according to taste (I use 1-2 serrano chilies)

For the sauce:
1/4 cup Thai fish sauce
1/4 cup lime juice
2 - 3 garlic cloves, minced
1/2 cup cilantro leaves, roughly chopped
1/4 cup chopped