Eggs with tomatoes

8 eggs 200 g field salad greens (mache, corn salad) 1 1/2 liters water 3 tablespoons vinegar 30 g butter 1 onion , chopped 4 tablespoons concentrated tomato[...]

1 (15 ounce) package refrigerated pie crusts, softened according to package directions (2 crusts) 2 eggs 1/2 cup half-and-half 1/8 teaspoon salt 4 slices[...]