I'm not a vegetarian because I eat fish and the occasional piece of chicken, but these are dishes I grew with so the habit of very little meat is ingrained. These are some one my favourite dishes.
Salads that can double up as a meal: tomatoes, avocados, fresh herbs, black olives, croutons, seasoned and tossed in a lemon/olive oil dressing. A couple of tablespoons of extra-virgin olive oil and a good squirt of lemon, depending on the size of the dish (use more or less). I use this dressing over cooked vegetables and legumes, too. My croutons are usually stale wholemeal bread torn into pieces. I don't oil them or toast them; there's no need to because they will absorb the dressing anyway.
Chickpeas with steamed spinach and garlic cloves, seasoned and dressed with lemon juice and olive oil.
Spaghettini with homemade pesto, sprinkled with freshly grated parmesan cheese. I get the parmesan at my grocery store already shredded and keep it in the freezer. Unlike the processed variety, it will go mouldy in time and keeping in the freezer prevents this.
Fried cheese (fried in a non-stick pan) and chopped spinach dressed with my lemon/olive oil dressing while it's still warm so that it can absorb it. Topped with black olive. I love haloomi, a cheese from Cyprus, that is perfect for grilling or frying.
Dessert, if any, is usually fresh fruit.
And once in a while, a treat, as long as it's made with dark chocolate and without chemicals and additives, like this chocolate tart by Dufflet.
Simplicity is the removal of the useless and the unnecessary--source unknown