This place just seems to keep getting better. I've been there a few times in recent weeks (Northfield location), with enough friends along to order more than the usual three or four dishes, and I keep being impressed with this place -- and, I'm happy to say, the folks I've introduced have also been impressed.
Menu is thoughtfully tagged GF for gluten free and V for vegetarian
I find that the daily specials are pretty much inevitably great, but I haven't really found anything I don't like on the regular menu. (I will say, however, that while everyone seems to want the bacon-wrapped dates -- and theirs are lovely at TG -- I find them to be one of the less interesting dishes -- perhaps because it's a dish that is so easy to make. But if that's your passion, they have them -- in a nice pepper cream sauce.)
The garlic and chile saturated black and green olives are ridiculously good. The red sangria is excellent. The black bean soup is fabulous.
Cold dishes: Their Pulpo a la Venagreta (poached octopus with tomato, red onion, cilantro, and sherry vinaigrette) is possibly the best octopus dish I've ever had. I love the avocado stuffed with tiger shrimp. Also great: Pisto Manchego (sautéed eggplant, zucchini, yellow squash, red and green peppers garlic and tomato) and Ensalada Marinadas (baby artichokes, roasted red and green peppers, roasted eggplant, fresh garlic in a sherry/ balsamic vinaigrette).
I almost always get more hot dishes (including those both identified as hot tapas and house specialties) than cold, as there are even more things I fancy on this side of the menu.
Among the hot tapas that have delighted me: Crepe Rellena (crepe filled with apples, goat cheese, spinach and pine nuts, with pimento butter), Queso de Cabra al Horno (oven baked goat cheese in a tomato basil sauce, served with garlic bread), Champiñones Rellenos (mushroom caps stuffed with a blend of mushroom, spinach, garlic and Spanish cheeses), Patatas Bravas (crispy fried little cubes of new potatoes served with a delicious, spicy red pepper sauce), Pimientos Del Piquillo (imported piquillo sweet peppers stuffed with three cheeses and spinach, served over black bean sauce--gooey and yummy), Pipirrana De Buey (grilled strips of marinated skirt steak on a bed of potatoes and onion, drizzled with Spanish blue cheese sauce).
"Specialties of the house" that we indulged in: Vieiras Con Espinacas (grilled jumbo sea scallops served over sautéed spinach with tomato lemon garlic sauce), Tilapia Al Caparas (grilled tilapia served over sautéed vegetables with a white wine, artichoke and caper sauce), Pincho de Pollo Y Chorizo (brochette of chicken tenderloin and chorizo with cumin mayonnaise and saffron rice), Chuletas De Cordero (three grilled lamb chops served over sautéed vegetables and a rich lamb reduction sauce), Nido De Cordero (confit of lamb hand pulled with fresh herb aioli sitting on a crispy potato nest with caramelized red onions), Pincho Solomillo (beef tenderloin brochette served over crispy potato sticks accompanied by caramelized red onions and creamy horseradish sauce).
Don't remember all the specials, but there was a lovely lobster ravioli a few weeks ago, a tender, flavorful pork loin a week ago, and last night, we had a wonderful beef tenderloin dish served with sweet potato strings. Very nice.
I'm not a dessert person, really, but they have some offerings that tempt even me -- though by the time we've gotten to dessert, we're pretty much limited to sharing, to keep from bursting. I enjoyed the taste of a friend's banana mousse, which was surprisingly good, but that was a special, so I'm not sure you'll see it again. Among the things on the menu, the desserts I've tried (and been dazzled by) include Tarta De Nueces con Caramelo Y Chocolate (freshly baked pecan and honey caramel tart topped with chocolate ganache--as rich as it sounds), Delicia De Chocolate (essentially a slab of ganache, though described as a chocolate terrine, with honey roasted pecans and fresh raspberry sauce), and Crema Catalana De Chocolate (creamy vanilla custard with bittersweet chocolate and caramelized sugar topping -- had this last night for the first time; essentially a Spanish creme brulée -- but so good, I can imagine going back just for that).
This has become a real favorite among a fairly diverse group of friends spread across the northern and northwestern suburbs (though, being a short skip off 94, it's pretty accessible to anyone with a car), and no one has been disappointed so far -- at least not when I was there.

Oh -- and we've still got a few weeks to enjoy their splendid, shaded patio -- should you be a fan of dining al fresco.