Look for the cleanest food on the menu.  Select the lightest meat or fish, so that the added butter/sauce is not fat on top of fat.

Fish:  Choose the shellfish or whitefish (at 400 calories/lb.) rather than salmon or trout (700-900 calories/lb.)

Meat:  Choose the chicken breast (at 500 calories/lb.) rather than steak (filet mignon is 1,000 calories/lb.)

Onion soup (small bowl): 150 calories.  But cheese on top makes it 350 calories, and with French bread it’s 420 calories

Escargot:  6 pieces w/ garlic butter is about 250 calories