In a deep saucepan, heat peanut oil to 350 degrees F.
In a large bowl, whisk together flour, cornstarch, pepper, fennel and salt.
Whisk in club soda and egg whites to form a smooth batter. Dip soft shell crabs in batter and fry in batches until golden brown, about 4 minutes per batch.
Drain on paper towels.
Serve crabs with Corn Relish.
Drizzle with Roasted Red Pepper Sauce and garnish with a pile of greens.
Steam corn kernels until crisp-tender, about 3 to 5 minutes, set aside.
Cut the kernels from the cob into a mixing bowl.
In a large skillet, heat olive oil over medium-high heat.
Add asparagus and mushrooms, cook until mushrooms give off their liquid and start to brown, about 3 to 5 minutes.
Add red pepper, jalapeno and green onion. Cook just until scallions wilt, about 2 minutes.
Add remaining ingredients, bring to a boil. Stir in corn mixture and cook until corn is heated through.
Combine pepper puree, shallots, and vinegar in a non-reactive saucepan. Bring to a simmer and simmer until shallots are tender.
Add cream and stir to combine.
Add lemon juice and whisk in butter, 1 piece at a time, until sauce is smooth and thickened. Season with salt, to taste.