INGREDIENTS
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3 Tbsp. unsalted butter
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2 Tbsp. olive oil
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1 large onion, chopped
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1 garlic clove, finely chopped
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6 cups corn kernels (from 6 ears)
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Kosher salt and freshly ground black pepper
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2 sprigs thyme
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Kosher salt
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2 1 1/4-lb. live lobsters
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1/2 small shallot, finely chopped
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2 tsp. fresh lemon juice
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1 tsp. Dijon mustard
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2 Tbsp. extra-virgin olive oil plus more for drizzling
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Freshly ground black pepper
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3 Tbsp. coarsely chopped celery leaves plus more for garnish
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1 Tbsp. coarsely chopped fresh tarragon plus leaves for garnish
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Flaky sea salt (such as Maldon)