In a large heavy pot or Dutch oven, melt the butter over medium heat. Cook the onion, stirring frequently, until soft and translucent, about 5 minutes.
Add the diced garlic, Snake Bite Datil Pepper Hot Sauce, and the Datil Zest Seasoning. Cook for 1-2 minutes, stirring constantly to prevent the garlic from browning. Add the 2 cans of tomatoes, the vegetable broth, the tomato juice and the sherry. Simmer, uncovered for 15 to 20 minutes.
Reduce heat to low and gently stir in the heavy cream and fresh basil leaves.
Serve with Garlicky Datil Zest Croutons (recipe follows)