Wash and dry all produce. Adjust rack to middle position and preheat oven to 425 degrees. Finely chop tomatoes. Trim, then thinly slice scallions. Mince or grate 1 clove garlic (we sent more). Cut potatoes in half lengthwise. Zest lemon until you have 1 tsp zest, then halve. Squeeze 2 TBSP juice into a small bowl.

Toss potatoes on a baking sheet with 1 TBSP olive oil and smoked paprika. Season with salt and pepper. Roast in oven until tender and lightly crisped, 20-25 minutes.

Stir together mayonnaise, mustard, half the lemon zest, half the lemon juice, and garlic in another small bowl. Season with salt.

Heat 1 TBSP oil in a large pan over medium heat (use a nonstick pan if you have one). Add crab cakes and cook until golden brown on bottom, about 4 minutes. Add 1 TBSP butter to pan, flip crab cakes, and cook until golden brown on other side, about 4 minutes more.

In a large bowl, toss together tomatoes, half the scallions, remaining lemon juice and lemon zest, a drizzle of olive oil, and half the arugula (use the rest as you like). Season with salt and pepper.

Divide crab cakes between plates, then arrange salad on top. Add potatoes to the side and dollop with aioli. Garnish with remaining scallions and serve.