Heat a large pot filled halfway with water over high heat until boiling. Add corn, cover, bring back to a boil, then lightly boil for 5 minutes. Remove corn from pot with tongs and let cool slightly. Once corn is cool enough to handle, slice the corn off the cobs into a medium bowl. Toss corn with tomato, chives, lemon juice, salt and pepper.
In a food processor, combine basil, extra virgin olive oil, garlic, juice of ½ a lemon, salt and pepper. Process until smooth. Poor into a small bowl.
Heat a non-stick skillet over medium high heat until very hot. Add butter and oil and swirl to melt and coat pan. butter is hot and begins to foam, add the scallops. Do not crowd the scallops, you’ll need to work in batches. Let scallops cook on the first side for about 2 minutes. Once the underside forms a nice golden crust, flip scallops and cook an additional 1-2 minutes, or until desired doneness. We like our scallops a bit undercooked in the center. Remove from heat.
Assemble tacos by adding avocado slices to each tortilla. Top with a spoonful of salsa. Add 1-2 scallops per taco. Drizzle with basil oil and serve immediately.