So did Luo eat what Ziyi cooked?

Whether he actually ate anything she cooked is, of course, unknowable.

It's obvious he didn't remember the bowl -- which doesn't mean he didn't eat what she'd cooked and put into it. Being male, it isn't likely he noticed the bowl, even more likely he didn't notice the design; as well, he had on his mind the building of the school.

And it's obvious he didn't know anything about her having cooked whatever he might have eaten -- which doesn't mean he didn't enjoy whatever it might have been.

Those facts being clear, he was honest when he said he didn't recognize the bowl. Then when he realized the importance of it to her of whether he did, he lied that he did remember it.

So she "tested" him by asking what he'd eaten from it. Then, as he couldn't answer that question either, he laughed -- getting caught in a second lie.

She didn't mind -- she likely understood he was protecting her feelings. So she simply continued from there, proudly ripping off exactly what she'd cooked for him the first three days.

Then he realized even more fully how important it was to her, so he told the truth -- "What a shame -- three delicious meals". Then added that mushroom dumplings are his favorite to perhaps soften the impact of the actual truth, but that doesn't mean he was lying about them being a favorite.

Two other points to note about that scene:

1. When he first enters the dining area, and is introduced to her mother, and throughout the meal, and when he stands to leave, you can see beyond and above his right shoulder the sleeve of her red jacket hanging down, with the sunlight directly on it.

Then, just before he leaves, he glances to his right and sees the sleeve, and pauses, looking at it. That reminds him, so when they're alone in the cooking area he pauses briefly to tell her she is pretty in that jacket, and that he saw her wearing it on his first day in the village.

2. When she's making the mushroom dumplings, and her mother speaks to her about Luo -- that she should forget about him because of a "better" class -- she looks perhaps defiant. Then, after she finishes up in the cooking area, she goes to the dining area, where her mother is still sitting at the table.

She sits down at the table, and (if you watch closely) each of them turns away from the other, as if there's a conflict. As if they are not talking to each other because having something of a spat.

We don't see any argument between them (it's possible there was one between her mother's comments, while she was making the dumplings, and her going to the dining area). So perhaps its because her mother knows from experience that there's no use arguing with her, because she can't be talked out of something she's determined to do. And because she is a bit angry at her mother for telling her to forget about him.

At any rate, there's much going on in that scene, some only communicated by glance -- as when Luo, when he stands, looks to his right and sees the sleeve of the red jacket. And some only by body language, as when she goes back to the dining area, and sits, and she and her mother turn slightly away from each other.

Here's another "detail" it took a while to notice (in fact I didn't see it until I got an HDTV widescreen TV):

In the scene in which she's getting the water, and the teacher comes out of the school and picks up his buckets to go to the well and get water, the village idiot (he annoys me) interferes, insisting on getting the water for him. (That was the second time he came between her and Luo; the first was when he took the red banner from her, which I think it's clear she had intended to give to Luo herself.)

As the idiot (he really does annoy me) is passing her at the top of the hill, and comments about her fetching water, she not only doesn't respond, but she also doesn't look at him at all; instead she looks straight ahead, as if he isn't there; as if deliberately ignoring him because, to her, he's an annoyance. (I wonder if he's one of the possible suitors she turned down.)

Then, when she is perhaps six feet past him, she wrinkles her nose and sniffs. Whether that was spontaneous, or indication of her attitude toward him, I of course don't know. Either way, intended or not, it effectively communicates that which appears to be the fact: that she doesn't want anything to do with him.