I started off by lightly toasting the bread (so it doesn't get soggy from the vegs) then placed tomatoes and yellow onions (which are not as spicy and sweeter than the red variety), spread liberally atop the toast.
As I was about done with my meal, mom turned out a pan of oven baked garlic slices for later. Naturally, being the experimental kind, I 'napped a few to accompany my last bite. Surprisingly, the taste of the baked garlic went superbly with the garden vegs in my sandwich. I guess I just found a new ingredient for the next round :)