Crab Stuffed Prawns With Tomato Butter

• 16 prawns
• 4 essence in all
• 1 stick butter (unsalted)
• 1 egg
• 1 shallots
• 260 gr lump crabmeat
• 120 gr tomatoes (plum)
• 120 ml shrimp stock
• 34 gr green bell peppers
• 32 gr parmigiano-reggiano cheese