Place sun-dried tomatoes in a bowl. Heat water in a kettle or pan to boiling and pour water over the sun-dried tomatoes. Leave tomatoes sit for about 15 minutes or until softened. Alternatively, you can place your sun-dried tomatoes in a microwave safe dish and cover with water. Microwave on high for about 2-3 minutes. Cover with plastic wrap and leave sit for 2 to 3 minutes or until the sun-dried tomatoes are soft and plump.