Yes, friends there’s the eternal battle between Good and Evil, and then there’s the martini, dispensing its chilly balm with the chaste aplomb of a wordless nun. Here’s the end of the workweek and the end of a day on which nothing bad or embarrassing happened (not speaking of the world at large), and obviously it was the perfect time for a dose of the purest, most radiant of cocktails. The formula is five parts Tanqueray gin to one part Noilly-Prat vermouth. What you see floating in the drink is neither twist of orange rind nor goldfish but a sliver of kumquat skin.

We have been enamored of the kumquat, smallest of citrus fruit, for several days. Thursday night, LL made a sauce for seared tuna with sliced kumquats and jalapeno peppers, and I tell you, that made the taste-buds jump and jive. And last night, in addition to the kumquat twist in the martinis, I squeezed about 10 of the little suckers to get enough juice for a vinaigrette, by-passing the usual lemon.

I had taken a grass-fed, organic ribeye from the freezer, thawed it and then marinated it in soy sauce, Worcester, red wine, salt and pepper for a few hours. I cooked it in the simplest manner possible, in olive oil and butter is an ungodly hot cast-iron skillet, about four minutes per side, so it came out a rosy-colored medium rare. I had also sliced fingerling potatoes fairly thinly, doused them with olive oil, salt, pepper and minced rosemary and put them under the broiler, and guess what I discovered, guess what revelation was granted unto my grateful spirit? If you use parchment paper under a broiler, it will catch on fire! No harm done, though these tiny moments of drama do spark up a life, so to speak.

I opened a bottle of the Robert Mondavi Cabernet Sauvignon 2005, Oakville District. This is available at retail for a range of about $30 to $48; I paid $60 at a silent auction to benefit a dog rescue group. (A different silent auction than the one I’ve been writing about recently.)

Many wine consumers know the story of the Robert Mondavi Winery, how Robert Mondavi quarreled with his brother Peter about the operation and goals of the family’s Charles Krug winery, and Robert split away from the family and started his own winery in 1966; how he achieved remarkable success, building Robert Mondavi into one of the Napa Valley’s great wineries and brands; how he collaborated with Baron Philippe de Rothschild, owner of Chateau Mouton-Rothschild, in the creation of Opus One; how lofty ambitions and lavish spending began to chip away at the family’s wine empire, forcing the family to take the private company public; of conflicts among the father and his sons, Tim and Michael; how the winery, at the end of 2004, was sold to Constellation (which still uses the image and words of the late Robert Mondavi himself in advertising and on the website). This chronicle is related in sometimes brutal detail in Julia Flynn Siler’s highly readable and cautionary The House of Mondavi: The Rise and Fall of an American Wine Dynasty.

While the winery produces often excellent wines in a variety of genres — the Fume Blanc 1 Block is one of the best in sauvignon blancs in California — the reputation mainly rests on its Bordeaux-style cabernet sauvignon blends, especially the reserve bottlings. This “regular” Oakville cabernet is a blend of 89 percent cabernet sauvignon grapes, 6 percent cabernet franc, 3 percent petit verdot and 1 percent each malbec and merlot. The wine aged 18 months in French oak barrels.

At a bit over four years old, the Robert Mondavi Cabernet Sauvignon 2005, Oakville, rests in a state of perfect equilibrium among all qualities and functions. This is a sleek, polished wine, smooth and savory and packed with spice, black currant and black cherry flavors, graphite-like minerals and the dry, slightly briery character of dense, chewy tannins. A few minutes in the glass bring up classic notes of cedar and tobacco, black olive, potpourri and bitter dark chocolate, finishing with a beguiling hint of mint and iodine. The wine embodies a gratifying sense of unassailable vitality and unshakable purpose. Drink now through 2014 or ’15. It was wonderful with the steak. Excellent. About $30 to $48.