This Split Pea Pesto Stuffed Shells dish began as a pantry-inspired experiment on a busy Sunday evening, and it quickly became a favorite for lighter, plant-forward dinners. I discovered the combination while staring at a bag of green split peas and a bunch of basil going soft in the fridge. I wanted something with the comforting satisfaction of stuffed pasta but without the heaviness of ricotta. The result is bright, herbaceous, and surprisingly creamy thanks to the cooked peas. The texture is velvety without oil or nuts, the basil cuts through with freshness, and the shells cradle the filling like little edible bowls. I make this when I want a feel-good meal that’s still substantial: the split peas add vegetarian protein and fiber so the dish keeps you full without being greasy. It’s an ideal dinner for spring or summer because the basil flavor sings, yet it’s comforting enough to enjoy any time basil is available. Friends have told me this is the kind of recipe they’d serve to guests to show that vegan can be both simple and elegant. Each bite offers a soft shell, a lemon-lifted filling, and a hit of warm marinara—balanced and comforting.

Ingredients

• Split peas: Use 1 cup dry green split peas for the pesto; they cook quickly and become naturally creamy. Look for non-split green peas for slower-cooking varieties, but split green peas are ideal here for texture.
• Water: 2 1/4 cups water, divided—2 cups to simmer the peas and 1/4 cup reserved to help loosen the pesto. The extra water lets you control thickness without adding oil.
• Fresh basil: 1/4 cup tightly packed fresh basil leaves provide aromatic lift. Italian Genovese basil or a supermarket sweet basil both work; pick fresh, glossy leaves for best flavor.
• Lemon juice: 1 to 2 tablespoons fresh lemon juice brightens the pesto. Start with 1 tablespoon and add more to taste for brightness without acidity overload.
• Garlic: 1 to 2 cloves minced—adjust to your household's tolerance. Fresh garlic gives a sharp background that the lemon and basil tame.
• Sea salt: 1 teaspoon fine sea salt to season the filling; adjust at the end to taste.
• Jumbo pasta shells: 12 ounces dried shells (about 24–30 shells depending on size) to hold the pesto filling; cook al dente so they keep shape in the oven.
• Marinara sauce: About 2 cups of your favorite marinara for the baking dish and topping; choose a simple, low-sugar brand or homemade sauce for best results.

Instructions

Cook the split peas: Place 1 cup dry green split peas and 2 cups of water in a small saucepan and bring to a boil over high heat. Reduce to a simmer, cover, and cook until the peas are very tender and breaking apart, about 25 to 30 minutes. Drain and rinse briefly under warm water to stop the cooking. The cooked peas should mash easily between your fingers—this texture is key for a creamy pesto without oil or nuts. Boil the shells: While the peas simmer, bring a large pot of salted water to a rolling boil and cook 12 ounces of jumbo shells according to package directions until just tender (al dente). Drain and spread shells on a baking sheet so they don’t stick. Cooking the shells concurrently saves time and ensures everything finishes together. Preheat and prepare baking dish: Preheat your oven to 350°F. Spoon about 1/2 to 3/4 cup marinara sauce to coat the bottom of a 9" x 13" baking dish—this prevents the shells from sticking and keeps the base saucy. Make the split pea pesto: Transfer the drained peas to a food processor. Add the remaining 1/4 cup water, 1/4 cup basil leaves, 1 tablespoon lemon juice, 1 clove minced garlic, and 1 teaspoon fine sea salt. Process until very smooth, pausing to scrape down the sides. Taste and add more lemon juice or the second clove of garlic if you want more brightness or bite. The mixture should be spreadable but not runny—add an extra tablespoon of water if needed. Fill the shells: Spoon roughly a heaping tablespoon of pea pesto into each shell and arrange the filled shells in a single layer in the prepared baking dish. Spoon additional marinara over each shell so the tops stay moist and the sauce seals into the baking dish. Bake and finish: Bake at 350°F until everything is heated through and the sauce is bubbling, about 25 to 30 minutes. Remove and garnish with additional fresh basil leaves. Let rest 5 minutes before serving so the shells settle.

Storage Tips

Store cooled leftovers in an airtight container in the refrigerator for up to 3 days. To freeze, place assembled shells (before baking) in a freezer-safe dish, cover tightly with foil and plastic wrap, and freeze for up to 3 months; when ready, bake from frozen, adding an extra 15–20 minutes to the bake time and covering with foil for the first half to prevent drying. Reheat refrigerated portions in a 350°F oven until warmed through, about 15–20 minutes, or microwave individual servings until hot—cover lightly to retain moisture.

Ingredient Substitutions

If you don’t have split peas, use cooked green lentils or cooked cannellini beans for a similar creamy texture—adjust water when processing to achieve the right consistency. Swap basil for a combination of basil and spinach (3:1) for a milder green pesto, or add a few roasted red peppers for sweetness. For a richer finish, swirl in 1 tablespoon of extra-virgin olive oil into the pesto, though the original keeps the dish very low in fat. Use gluten-free pasta if needed and increase seasoning slightly to compensate for any neutral-tasting substitutes.

Serving Suggestions

Serve warm with a simple green salad dressed in lemon and olive oil to echo the pesto’s brightness, and crusty bread (gluten-free if needed) to sop up extra marinara. Garnish with fresh basil leaves and a grind of black pepper. For a heartier meal, add roasted seasonal vegetables—eggplant or zucchini roast beautifully alongside and add texture. Pair with a light Italian white wine or sparkling water with lemon to keep the meal feeling fresh.

Cultural Background

This recipe is inspired by classic Italian stuffed pasta traditions—conchiglioni or shells are often filled with ricotta and spinach in Italy—but here the filling uses split peas, a pulse common across European and Mediterranean cooking for centuries. The use of basil ties it to Ligurian pesto traditions, while the pea base echoes how cooks have historically used legumes to create creamy, protein-rich fillings when cheese was not available. It’s a modern, plant-based nod to those regional practices.

Seasonal Adaptations

In spring and summer, use the freshest basil available and serve with a side of grilled asparagus. In cooler months, swap in a small handful of kale (blanched first) for basil and add a teaspoon of smoked paprika to the marinara for warmth. For holiday gatherings, assemble shells ahead and top with a drizzle of walnut-based pesto if nuts are desired; roast cherry tomatoes to scatter over the top for color and sweetness.

Meal Prep Tips

Make the pesto up to two days ahead and refrigerate in a covered container. Cook shells and cool them on a sheet tray; stuff and arrange in the baking dish the night before. Keep covered and refrigerated, then bake when you’re ready—this reduces evening time to just the bake, making it ideal for busy households. Label containers with the date, and freeze extras for quick weeknight meals.

Simple, bright, and adaptable, these stuffed shells make a satisfying centerpiece for any meal. They prove that plant-based can be comforting and celebratory—give them a try and make the pesto your own with small tweaks that reflect your pantry and taste.