To prepare the fish: Trim, rinse, and pat dry sanddab fillets and place in bowl. Mix white wine, garlic, olive oil, and lemon juice and gently toss with sanddabs. Cover and marinate for 30 minutes in refrigerator. Mix flour, salt, cracked peppercorns, and fresh herbs together and set aside.
To roast tomatoes and prepare salad: Seed 2 large fresh tomatoes, slice 1/2-inch thick, baste with olive oil, and grill over open flame. Cool and coarsely chop into 1/2-inch chunks. Mix together tomatoes, arugula, and tri-colored peppers, and set aside. Whisk together 1 cup olive oil, vinegar and honey, add salt and pepper, to taste. Heat dressing slowly in small saucepan and keep warm.
To cook the fish: Dredge marinated fillets in flour-herb mixture to coat completely. Brown butter in a skillet over medium-high heat and saute fillets for about 2 minutes per side. Remove from pan to individual serving plates and keep warm.
To serve: Toss salad with warmed dressing, arrange on top of sanddabs. Spoon small amount of remaining dressing around plate and garnish with lemon slices. Serve immediately.
Sanddabs can be very fragile, especially after cooking. Be very gentle and eliminate multiple transfers from pan to plate. All preparation can be completed hours prior to final cooking. If this is done, this is an easy 10-minute recipe that is great for a quick dinner or entertaining.