the sauce is a mustard-based creamy radish dressing
not some fake French dressing. notice how the pork is actually cooked properly and has a crispy edge with smoky bits for texture and the loin itself is juicy and flavorful. serve with a side of chilled salad and white wine.
women like a man who can cook (much the same as a man likes a woman who can cook, goes both ways). however preparing "grill food" is a very stereotypically manly thing. grilling steaks, veggies, sausages, preparing roasts and ribs and loin, making marinates and sauces, et c.
if this the measure of Lucas as a man who cooks, then maybe it's best he test it out on himself and unfortunates before horrifying a theoretical date with his 'food'.