Melt butter in pot and cook onion over medium heat.Add garlic,thyme,salt and pepper and cook 1 minute,stirring.
Add broth and 1 1/2 cups of water and simmer.
Add potatoes to simmering broth and cook 20 minutes.
Stir in corn and tomatoes and cook 15 more minutes. Garnish with sour cream and tarragon.
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