In a small skillet, saute onion and rice in 2 tablespoons butter until rice is browned. Add the water, soup, lemon juice, chives, parsley and bouillon. Bring to a boil. Reduce heat; cover and simmer for 25 minutes or until rice is tender and liquid is absorbed. Remove from the heat and cool slightly. Preheat oven to 375°.
Sprinkle hen cavities with salt and pepper; stuff with rice mixture. Place with breast side up on a rack in an ungreased 13x9-in. baking pan. Melt remaining butter and add tarragon; brush some over the hens.
Cover loosely and bake for 30 minutes. Uncover and bake until a thermometer reads 170° for hens and 165° for stuffing, 30-45 minutes longer, basting frequently with tarragon butter.
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