Set up at lunchtime, on the table by seven
Most marinades exist to soften economical cuts. This one's different — a T-bone doesn't need tenderising, so the balsamic's job is pure flavour: a dark, faintly sweet edge that deepens the crust and seasons the meat a few millimetres in. Whisk it together at lunchtime, slide the steak in, and by dinner the work's already done. Two rules keep it honest: pat the steak properly dry before it hits the pan, and don't run the heat at full blast — balsamic's sugars like medium-high, not scorched.
Ingredients
- 1 Your Farmer grass-fed beef T-bone steak (about 500g)
- 80ml balsamic vinegar (for the marinade)
- 2 tbsp olive oil (for the marinade)
- 2 cloves garlic, crushed (for the marinade)
- 1 tbsp brown sugar (for the marinade)
- 1 sprig rosemary, leaves stripped and chopped (for the marinade)
- 1/2 tsp cracked black pepper (for the marinade)
- Salt to season
Instructions
For the marinade
Whisk the balsamic, olive oil, garlic, brown sugar, rosemary and pepper together in a dish that fits the steak snugly. Spoon 2 tablespoons into a small bowl and set aside — that's your finishing drizzle, kept clear of the raw meat.
80ml balsamic vinegar2 tbsp olive oil2 cloves garlic1 tbsp brown sugarAdd the steak, turn to coat, cover and refrigerate for at least 2 hours, turning once — up to 4 hours is fine, but no longer, or the vinegar starts working against the meat's texture.
1 T-bone steakFor the steak
Take the steak out of the fridge 20 minutes before cooking. Lift it from the marinade and pat it thoroughly dry with paper towel — a wet, sugary surface burns before it browns. Season with salt.
Heat a grill pan over medium-high — deliberately not maximum; the marinade's sugars char at full heat.
Cook 4 minutes with the smaller fillet side angled toward the pan's cooler corner — it's leaner than the sirloin side and finishes first.
Turn once and cook another 3–4 minutes, to 52–54C in the thickest part of the sirloin side for medium-rare.
Rest on a warm plate, loosely covered, for 8–10 minutes.
Carve both muscles off the bone, slice across the grain, and serve with the reserved marinade drizzled over — mash, polenta or a bitter-leaf salad alongside.
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Marinating a Steak That Doesn't Need It
Marinades earn their keep on hard-working cuts — that's their day job. A T-bone is different: the sirloin and fillet on that bone are already tender, so the balsamic isn't there to rescue anything. It's there for flavour — a dark, sweet-sour edge that caramelises into the crust and seasons the outer few millimetres of the meat. That's also why the window is short. Two to four hours is the sweet spot; past that, the vinegar starts softening the surface into mush and the sweetness takes over the beef. Your Farmer® T-bones are 100% grass-fed and about 500g, one in each Pack B and Pack D box of the CSA beef share — and grass-fed beef's clean, savoury depth is exactly what keeps a sweet marinade in balance. On the heat, remember the cut's one rule: the lean fillet side finishes first, so give it the cooler corner of the pan.
Swaps and Variations
Honey and red wine vinegar make a gentler version of the same idea; a splash of soy sauce swaps in for some of the salt and adds depth. Thyme stands in for rosemary without complaint. The hooded barbecue handles this beautifully too — same medium-high discipline, and move the steak to indirect heat if the sugars start flaring. If marinating is your favourite trick, it belongs first on the cuts built for it — the marinated topside steaks with herb yoghurt show it at full stretch, and our guide to cooking grass-fed beef covers when to marinate and when to leave well alone.
Storage and Leftovers
Any marinade that touched raw meat gets binned — that's why the finishing drizzle is set aside at the start, before the steak goes in. Thawed raw steak keeps 2–3 days in the coldest part of the fridge (marinate within that window), and cooked leftovers keep 3 days airtight. Cold balsamic steak is a quiet triumph: sliced thin with rocket, shaved parmesan and a drop of oil, it's tomorrow's lunch sorted. Reheat only in a brief flash of pan heat, and save the bone for stock.
Frequently asked questions
Can I marinate the steak overnight?
Why did my steak char black?
Is it safe to drizzle marinade over the cooked steak?
Can I cook it on the barbecue instead of a grill pan?
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