BBQ Iterary

Foil packs prepped on a tray with whole onions and a teaspoon of shiro miso

Foil-Baked Onions & Garlic

April 26, 2026 · Sunday Cook
Attempt #3
Foil-Baked Onions with Soy Sauce · Foil-Baked Garlic with Miso
The Japanese Grill by Tadashi Ono & Harris Salat · Page 150

Two foil packs, opposite jobs

Same book. Same page. Two recipes that look like a pair: heavy-duty foil, halved bulb, fold and grill. Onions get a brush of soy sauce. Garlic gets a thin layer of shiro miso on the cut side, seam-side up.

I've been making both of these for a while now. This was my third honest attempt at running them together, and I went into it thinking the foil method made them basically the same recipe. They aren't.

The Kamado Joe with whole onions on the left side of the grate and foil-wrapped garlic packs on the right

Sunday cook, low-and-slow

Grill Kamado Joe, dome ~250°F
Hand-test ~8 seconds over the grate (medium, by the book)
Onions 2 Spanish (halved + one whole), 2 red onions, soy sauce
Garlic 4 heads of basic American garlic, halved, shiro miso on the cut side
Sharing the grate Bone-in chicken thighs, frozen, direct — surprise success (more on that below)
A black tray with four heads of garlic, three Spanish onions, and three red onions before prep

Why this book teaches by feel

Sidebar: the hand-test

One of the things that makes The Japanese Grill stand out from every other grilling book on my shelf: it doesn't tell you a number. It tells you to put your hand a few inches over the grate and count how long you can hold it there.

HeatHand-testMy Kamado dome
Hot3-4 seconds~450°F+
Medium-hot5-6 seconds~350°F
Medium8-10 seconds~250°F

Most American grill books chase numbers. This one trusts the cook to feel it. After three attempts at these two recipes, I think the hand-test is more right than the dome thermometer ever was. Different grill, different ambient day, different food — the dome lies to you. Your hand doesn't.

The recipes both call for "medium." On my Kamado, that calibrates to ~250°F dome. So that's where I ran the cook.

The Kamado Joe dome with the thermometer reading in medium territory

Onions: built to be ignored

The onion recipe wants 35 minutes wrapped tight, turned at 10 and again at 20. Soy sauce caramelizes inside the foil. The recipe specifies Spanish onions halved across the center; I did that, plus a whole one for the hell of it, plus two red onions on top of the recipe call.

All of them came out great. The Spanish halves were the textbook win — sweet, soft, deeply caramelized. The whole one took the same amount of time and was almost more dramatic when you peeled it open. The red onions didn't read as Japanese anymore but they were good in their own way. The recipe is forgiving like that. Onions want time, and 30 minutes hands-off was fine for them.

A cooked whole onion with deeply caramelized skin sitting on a red plate next to foil packs

Garlic: a 12-minute window

Here's where I learned something. The garlic recipe is 12 minutes, turned once. Not 35. Twelve.

I did not pay attention to that. I put the garlic packs on the grill at the same time as the onions and walked away in 30-minute stretches like I was doing one cook, not two. By the time I unwrapped them, the miso had gone past caramelized and into char. About 40% of the cloves I had to pick around or throw out.

An unwrapped half-head of garlic with charred miso on the cut side, next to closed foil packs on a blue plate

Same pack, opposite tolerances

Onions forgive. Garlic doesn't. The foil method makes them look like the same recipe but it really is two different cooks happening on the grate at the same time. That's the whole lesson of attempt #3 right there.

The trade-off

The thing I want to be honest about: this was the lowest-effort cook I've done with these recipes. Set the temp, walk away, drink something, come back. The onions handled the abuse beautifully. The garlic paid for it.

Less work, less yield. Both true. That's not failure — that's just the math you're picking when you choose how attentive you want to be.

Why I'll be back

The garlic that did survive tasted exactly like what the recipe promised. Soft, sweet, savory from the miso, almost potato-textured. Not bitter. The recipe isn't wrong. I am, for now. Three attempts in, I haven't fully cracked the timing on the garlic, but every cook gets me closer to it, and the cloves that come through clean are worth showing up for.

The family verdict on the spread overall: they liked it. The chicken got picked over fast, the onions disappeared, and the un-burnt garlic got fought over.

A red plate with foil-baked onions and garlic next to a blue plate of grilled chicken thighs on the dinner table

The chicken got lucky

Quick aside, because it surprised me more than anything else today: bone-in chicken thighs, straight from the freezer, direct on the grate at 250°F. No defrost, no brine, no marinade. They came out great. One was a touch overdone but the rest were excellent.

That's a different post and probably a different book, but file it away. The Kamado at low-medium does a lot of work without you.

Grilled chicken thighs on a blue plate with crispy charred skin

Next time

Same temp. Same packs. The plan for attempt #4: pull the garlic at 12 minutes, leave the onions for the full 35. Set a timer for the garlic, because I clearly cannot be trusted to feel it. And use heirloom garlic instead of basic supermarket heads — might tolerate the heat differently.

The book

If you only get one grilling book this year

This one. The Japanese Grill by Tadashi Ono and Harris Salat is on its third year of beating up other cookbooks on my shelf. It teaches by feel instead of by numbers, the recipes are short and uncluttered, and the flavor profile — soy sauce, miso, shichimi — turns out to be exactly what a Kamado wants.

You don't need a Japanese grill to cook from it. You barely need a recipe. You need the book's framing of how to grill, and the rest follows.

Get it on Amazon

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