Main Dishesbonappetit4.3
Potato-Tomato Gratin With Horseradish
This unconventional (and dairy-free) take on potato gratin strikes the perfect balance of rich and bright thanks to jammy tomatoes and a generous dusting of zingy fresh horseradish.
👥 4 Servings👤 Christian Reynoso📖 bonappetit
🥘 Ingredients
Check off ingredients as you prepare them:
🍳 Cookware
- ●skillet
- ●bowl
- ●oven
- ●measuring cup
- ●baking dish
📝 Preparation Steps
1
Arrange a rack in middle of oven; preheat to 350°F. Heat 1 Tbsp. oil in a large skillet over medium-low. Add onion, garlic, and ½ tsp. Diamond Crystal or ¼ tsp. Morton kosher salt and cook, stirring often, until onion and garlic are softened and translucent but without taking on any color, 5–⏱️ 7 minutes. Remove from heat and stir in prepared horseradish, tomato paste, and red pepper flakes, and 1 Tbsp. thyme leaves. Transfer to a large bowl.
large onion, thinly sliced1. thyme leaves, divided2 Tbsp
2
Combine broth and remaining 2 tsp. Diamond Crystal or 1 tsp. Morton kosher salt in a small bowl or measuring cup, stirring to dissolve salt; set aside.
3
Add potatoes to bowl with onion mixture and toss to combine. Arrange groups of 4–5 tomato slices and 4–5 potato and onion slices in alternating stacks in a 2–2½ qt. baking dish or medium cast-iron skillet so edges are aligned vertically, working your way around perimeter of dish before moving into center. The pieces should be very tightly packed; tuck leftover onion filling into any gaps.
large onion, thinly sliced1
4
Pour reserved broth over vegetables and drizzle with 3 Tbsp. oil. Cover tightly with foil and bake until potatoes are tender and tomatoes are juicy, 40–⏱️ 50 minutes. Increase oven temperature to 425°, uncover baking dish, and continue to bake until liquid is reduced by about half, tomatoes are concentrated and jammy, and potato edges are golden brown and crisp, 30–⏱️ 45 minutes more. Let cool ⏱️ 15 minutes.
5
Drizzle gratin with a little more oil if desired and sprinkle with sea salt and remaining 1 Tbsp. thyme leaves. Finely grate as much fresh horseradish over as you’d like.
. thyme leaves, divided2 Tbsp
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