Food safety reminder: Follow safe food-handling practices and use a food thermometer to verify safe internal cooking temperatures.
- 1 sheet puff pastry (or pizza dough), about 10–12 oz (280–340 g) - 2 lb (900 g) yellow onions, thinly sliced - 3 tbsp (45 g) unsalted butter - 2 tbsp (30 ml) olive oil - 1 tsp (4 g) sugar - 1/2 tsp (3 g) salt - 1/4 tsp (0.5 g) freshly ground black pepper - 4 oz (115 g) anchovy fillets packed in oil, drained - 1/2 cup (75 g) black Niçoise or Kalamata olives, pitted - 1 tbsp (15 ml) balsamic vinegar (optional, for depth) - 1 tsp (2 g) fresh thyme leaves, stripped
1. In a wide heavy skillet over medium-low heat, melt butter with olive oil, add sliced onions, salt, and sugar, and cook slowly, stirring occasionally, until onions are deeply soft and caramelized, about 40–50 minutes; stir in balsamic vinegar near the end if using. 2. Preheat oven to 425°F (220°C). Roll out pastry to fit a baking sheet, score a 1/2-inch (1.2 cm) border, blind-bake for 8–10 minutes until just set. 3. Spread the cooled caramelized onions evenly over the par-baked crust, lay anchovy fillets in a lattice or rows, scatter olives and thyme, and bake 12–15 minutes more until pastry is golden; cool slightly, slice, and serve warm or at room temperature.
Per serving | Servings: 6
Nutrition estimated: November 13, 2026
*Values are estimates based on USDA data and mathematical calculations. Actual values may vary. Where data are unavailable, those contributions are excluded. Calories, Carbohydrates, Protein, Fat, Sodium, Potassium, Calcium and Iron are known subtotals. Saturated fat, Vitamin A and Vitamin C are known subtotals, with data for 9 of 10 ingredients. Cholesterol, Fiber and Sugar are known subtotals, with data for 8 of 10 ingredients. Missing contributions are unknown, not zero.