Corn and Tomato Salsa

1 cup fresh corn kernels (from 2 small ears) or frozen, thawed
1 large tomato, seeded, chopped
2/3 cup chopped red onion
1/2 cup chopped fresh cilantro
2 tablespoons olive oil
1 tablespoon fresh lemon juice
1/2 teaspoon ground cumin
1/2 to 1 jalapeño chili, seeded, minced
1 avocado, pitted, peeled, chopped
Fresh cilantro sprigs

Mix all ingredients together in a large bowl, cover and chill before serving.